Download the Logical Scissor Gate on Thangs:
https://than.gs/m/1604570?affiliateCode=logicalplanet

I made the Logical Scissor Gate mostly because I thought it would be awesome—and it is.

A large, functional structure built almost entirely with 3D-printed parts feels like an incredible leap forward from where I began with 3D printing not that many years ago. This is not a small gadget or a decorative model. It is a working expandable barrier that can cross a substantial opening, collapse into a compact package and even be stacked to create additional height.

Inspired by the gates I saw in China

I have always liked this particular style of scissor gate. I saw them used extensively in China and was immediately struck by their usefulness.

The scissor gates I grew up seeing were usually thin, flat barriers that depended heavily on being attached to a wall. The Chinese gates that caught my attention were very different. They used thick, repeating frames that allowed the structure to support and stabilize itself. Some were large enough to cordon off an entire parking lot, yet they could still collapse into a relatively compact space when not needed.

That combination of scale, movement and compact storage stayed with me. It also made the design a particularly interesting challenge for 3D printing: could I reproduce the same basic structural idea as a modular system made from printable components?

A gate built one bay at a time

The Logical Scissor Gate is not designed around one fixed opening. Its width is created by adding or removing repeating bays, so the same basic components can be used to build gates of different lengths.

Each bay provides 100 mm of nominal width and can extend to approximately 120 mm. When collapsed, each bay compresses to approximately 15 mm. That gives the finished gate a useful range of movement while keeping it surprisingly compact when folded.

A nominal 1 metre gate contains ten 100 mm bays and can extend to approximately 1.2 metres.

Stackable as well as expandable

Width was only part of the idea. Complete gate modules can also be connected vertically, allowing the finished barrier to be built in 320 mm height increments.

Printed Stackers join the Frames of one module to the Frames of the module above it. This makes the system adaptable in two directions: repeat the bay pattern to change the width, and stack complete modules to change the height.

Although a single module can stand independently for light-duty barrier use, wall mounting is strongly recommended for stacked gates. Increasing the height also increases the load on the Frames, Stackers and mounts.

A fully printed mechanical system

One of my favourite things about the project is that the gate itself does not require conventional non-printed hardware. The moving structure is assembled from printed Arms, Connector Axles, Connector Plugs and Frames. Stackers and optional wall-mounting parts extend the system further.

The core parts are:

• A1 Arms
• A3 Arms
• A4 Arms
• Frames
• Connector Axles
• Connector Plugs
• Stackers for connecting modules vertically
• Top and Bottom Mounts for securing the gate to a suitable surface

The crossed arm layers pivot on the printed axles, while the repeating Frames give the structure its depth and help it remain upright. That three-dimensional frame arrangement is what makes this design feel so different from a thin, wall-mounted scissor gate.

Planning the size of a gate

Because the design is modular, the number of parts depends on the finished width and the number of vertically stacked modules. I created a parts calculator to make that planning easier.

For a basic gate, quantities are calculated in 100 mm nominal-width increments. A taller gate multiplies the core component quantities by the number of modules, with one Stacker required at each Frame connection between modules.

The calculator link is included with the model documentation on Thangs.

How the gate goes together

Assembly begins by laying out the first arm layer. An A1 Arm and A3 Arm form the ends, while the A4 pattern repeats between them until the required width is reached.

A second arm layer is placed perpendicular to the first, and Connector Axles are inserted through the centre joints.

Connector Plugs secure the exposed outside joints. The final arm layer is then aligned over the Connector Axles, and the remaining outside joints are completed with additional Plugs.

The Frames are installed one axle column at a time. Each Frame flexes slightly into position, then locks onto the flat-sided Connector Axles. Once all the Frames are installed, the gate can be opened and collapsed slowly to confirm that every joint moves freely and all Axles, Plugs and Frames remain fully seated.

Connecting modules vertically

To build a taller gate, a Stacker is pressed onto the top of every Frame in the lower module. The Frames of the next module align with those Stackers and press fully into place.

Every connection should be checked carefully. There should be no gap between a Frame and its Stacker, and a stacked gate should be mounted securely.

Optional wall mounting

For a frequently used or taller gate, I strongly recommend using the Top and Bottom Mounts. They attach to a secure surface using fasteners appropriate for that wall material. The end Frame then lifts onto the two mounts and lowers into its seated position.

The correct screws and anchors will depend on the mounting surface, so those fasteners are not specified as part of the printed system.

Printing recommendations

This version of the gate requires a 320 × 320 mm print bed. I also made a separate version for 250 × 250 mm print beds.

The parts are designed to print without supports when the supplied STL or 3MF orientation is used. These are functional components, so they should be printed more substantially than a typical decorative model.

My recommended starting settings are:

• Material: PLA or PETG for indoor use; ASA for outdoor use
• Nozzle: 0.4 mm
• Layer height: 0.2 mm
• Line width: 0.4 mm
• Walls: 4, providing 1.6 mm total wall thickness
• Top and bottom layers: 5, providing 1.0 mm total thickness
• Detect thin walls: On
• Wall generator: Arachne
• Infill: 70% cubic
• Brim or raft: Not normally required
• Supports: None required
• Orientation: Use the supplied STL/3MF orientation

Material choice and print settings are ultimately up to the person making the gate and the intended use. For something expected to remain in service for years, I recommend the higher infill and a more durable, weather-resistant material such as ASA for outdoor use.

An important safety note

The Logical Scissor Gate contains moving scissor joints that can pinch fingers. It is not a certified child-safety gate and must not be used at the top of stairs or anywhere a failure could cause injury.

It is best treated as a configurable general-purpose barrier. The appropriate size, material, mounting method and level of supervision depend on where and how it will be used.

Why this project matters to me

This is one of those designs that reminds me why I became so interested in 3D printing in the first place.

Not that long ago, I was amazed simply to watch a printer produce a small usable object. Now I can design a large mechanical structure made from many repeatable printed components—a structure that expands, collapses, stacks and can be adapted to the space where it is needed.

There is something deeply satisfying about watching all those individual printed parts become one coordinated mechanism. The fact that it looks and moves like the substantial scissor gates that originally inspired me makes it even better.

And yes, I still think it is awesome.

Download the Logical Scissor Gate on Thangs:
https://than.gs/m/1604570?affiliateCode=logicalplanet

If you build one, I would love to see how you configure it and what you use it for. You can also find more of my designs at logicalplanet.com or contact me at logicalplanet3d@gmail.com.

The post Logical Scissor Gate first appeared on logicalplanet.

Click here to download STL (Affiliate Link)

Download the Blue Bin Hanger on Thangs

This is one of those “Why buy it when I can print it?” projects.

I wanted to get my blue recycling bins off the ground and organized. I did not need a complicated storage system—just a small, strong wall-mounted hanger that would hold the rim of each bin securely while keeping the bins easy to lift off when I needed them.

The result is the Blue Bin Hanger: a simple and very useful print that turns an unused section of wall into practical recycling-bin storage.

Getting the Bins Up and Out of the Way

Blue bins are useful, but they tend to occupy a surprising amount of floor space. Mine were sitting on the ground, where they looked untidy and made the area harder to keep organized.

The obvious answer was to hang them on the wall. The top rim of the bin already provides a strong, convenient place to support it, so the design only needed to capture that rim securely and let the bin lift on and off without fuss.

That is really the whole idea behind this project. It is not intended to be mechanically elaborate. It is a purpose-built part that solves a small, everyday problem—and it is exactly the kind of job for which having a 3D printer is so useful.

A Small Hanger with Some Useful Flexibility

The hanger is split into two receiving sections. This lets it accommodate smaller bins whose upper rims contain more ribs, rather than requiring one wide uninterrupted section of rim.

Each hanger requires only one screw, although it includes mounting holes for as many as six. I recommend using three screws for a secure installation. The spacing between the left and right hangers can be adjusted to suit the particular bin; mine are installed approximately 290 mm (11.5 inches) apart.

I also included an optional wedge for installation on sloped siding. The wedge compensates for the angle so the hanger itself can sit in the correct orientation. On a flat wall, the hangers can be installed without it.

Because the two hangers are positioned independently, there is no fixed rail or frame dictating their spacing. Set them to match your bin, fasten them to the wall, and the rim of the bin drops into place. The bin stays off the ground but remains easy to remove whenever it is time to use or empty it.

Dimensions

Each Blue Bin Hanger measures:

• 80 mm wide
• 80 mm high
• 18 mm deep
• 6 mm mounting-plate thickness
• 48 mm overall height at the front hook
• 28 mm hook height

The detailed drawing below includes the mounting-hole spacing and the dimensions of the two receiving sections.

Before mounting the hangers, check the shape and rib spacing of your own bin rim and determine the best distance between the two hangers. The approximately 290 mm spacing shown in my installation is a reference, not a required fixed dimension.

Printing the Hangers

This is a functional, load-bearing print, so strength matters more than it would for a decorative model. I recommend reviewing the slicer settings carefully rather than relying on a typical default profile.

The files are supplied in the intended print orientation. No slicer-generated supports are required. A small removable support is built into the model where needed; remove it after printing.

My recommended settings are:

I use ASA for an outdoor installation because it is better suited to weather and UV exposure. PETG is suitable for indoor or sheltered locations. As with any wall-mounted functional print, the strength of the installation also depends on using appropriate fasteners and attaching the hangers to a suitable supporting surface.

Installation

Installation is straightforward:

1. Hold the bin against the wall at the height where you want it stored.
2. Identify sections of the upper rim that fit securely into the split hanger profile.
3. Mark the position of both hangers. My hangers are approximately 290 mm apart, but yours can be spaced to suit your bin.
4. If mounting on sloped siding, place the optional compensation wedge behind each hanger.
5. Fasten each hanger to a suitable supporting surface. One screw is the minimum the design accommodates; up to six can be used, and I recommend three.
6. Lower the rim of the bin into the two hangers and confirm that it is properly seated before loading the bin.

Fastener selection will depend on the wall material and what is behind it, so use screws and anchors appropriate to your installation.

One of Those Satisfying Little Prints

Not every useful 3D-printing project has to be a complicated mechanism or a large assembly. Sometimes the best designs are the small ones that solve an annoyance and then quietly keep doing their job.

For me, this was simply a matter of getting the blue bins off the ground and giving them a proper place. A couple of compact printed parts did exactly that. The area is tidier, the floor is easier to keep clear, and the bins are still immediately accessible.

If you have similar recycling bins taking up floor space, you can download the Blue Bin Hanger from Thangs and adjust the mounting spacing to suit your own setup.

Download the Blue Bin Hanger on Thangs

If you print it, I would be interested to see how you use it—and whether your local blue bins have the same rim style as mine.

The post Blue Bin Hangers first appeared on logicalplanet.

I needed a small garbage bin that I could mount exactly where I wanted it, without taking up floor or counter space. I also wanted it to be genuinely convenient: easy to use, quick to remove for emptying, and just as quick to put back.

The lid—or more accurately, the flap—was the part that needed the most thought. It had to stay properly closed when the bin was sitting idle, but it could not take so much force to open that it got in the way of simply dropping something into the bin. The Logical Wall Bin is what I came up with.

A Small Bin for the Places That Need One

This is not intended to replace a full-size kitchen garbage can. It is a compact 4.5 L (1.2 gal) bin for the places where a small, conveniently positioned waste container is more useful: beside a barbecue, on a patio, in a workshop or garage, or on a kitchen cabinet door.

At 248 × 130 × 230 mm (9.8 × 5.1 × 9.1 in), it has a fairly low profile against the mounting surface. It can be permanently mounted to a wall or cabinet, or hung over a cabinet door without drilling into it.

The bin itself lifts in and out of the upper frame, so taking it away for emptying or cleaning does not involve removing screws or disturbing the mounting hardware. A large snap-on handle makes it easy to carry once it is out of the frame.

That quick on-and-off action was one of my main objectives for the design. A wall-mounted bin is only convenient if emptying it is convenient too.

Drop Something In and the Flap Does the Rest

The top flap rests horizontally across the opening. Drop waste onto it and the weight rotates the flap open, allowing the waste to fall into the bin. Once the item has passed through, the flap returns to its closed position automatically.

There is no lid to lift by hand and nothing needs to be left standing open while you work.

Four 6 × 3 mm magnets—two in the flap and two in the frame—hold the flap in a stable horizontal position. They also help prevent wind, birds and larger insects from pushing or pulling it open, which is useful when the bin is installed outdoors.

The goal was not simply to make the magnetic hold as strong as possible. Too much force would defeat the easy-opening action. I wanted enough holding strength to keep the flap properly closed, without making it an obstacle during normal use.

The magnet positions are offset from front to back, which gives you some control over the flap action. Install the flap in the direction that produces the opening force you prefer. You can also rotate it 180 degrees to disable the magnetic hold entirely.

Two Ways to Mount It

I designed the same bin frame to work with either a fixed wall mount or removable cabinet-door hangers.

Wall mounting

The supplied wall fixture is attached with fasteners appropriate for the mounting surface. The upper frame then lowers onto the fixture’s hooks. This keeps the installation straightforward and allows the frame to be removed without taking the fixture off the wall.

Cabinet-door mounting

For installations where holes are not desirable, the files include hangers for three common door thicknesses:

• 19.1 mm (0.75 in)
• 25.4 mm (1.00 in)
• 31.8 mm (1.25 in)

Choose the hanger that matches your door, place a pair over the top edge, and lower the bin frame onto them.

The mounting choices make it easy to try the bin in a kitchen and later move it to a workshop, barbecue area or another location without needing a different bin.

Simple, Modular Assembly

The design is divided into practical parts: the bin, upper frame, flap, handle, wall mount, and cabinet-door hangers. The exploded view below shows how the pieces relate to one another.

The handle slides upward into guides formed into the side of the bin. Once fully seated, its lower tab snaps into place. To remove it, pull the lower locking tab forward and slide the handle downward.

The four magnets are designed to press into their holes. Check the polarity before inserting them fully: each magnet in the flap needs to attract the corresponding magnet in the frame. If your printer’s tolerances leave them a little loose, a small amount of adhesive can be used to secure them.

The flap then lowers into the frame, with its pivot points aligned to the matching recesses. Once installed, it should rotate freely and return quickly to a stable horizontal position when released.

Size and Capacity

The assembled Logical Wall Bin measures:

• Width: 248 mm (9.8 in)
• Depth: 130 mm (5.1 in)
• Height: 230 mm (9.1 in)
• Capacity: approximately 4.5 L (1.2 gal)

Its narrow depth keeps it from projecting too far into the room, while the height and width provide useful capacity for a small utility bin.

Printing the Logical Wall Bin

For indoor use, I recommend PLA or PETG. For outdoor installations, use ASA or another material suitable for prolonged heat, weather and UV exposure.

The parts are supplied in their intended print orientations. No slicer-generated supports are required; small built-in supports are already incorporated where needed. The orange areas shown below should be removed before installing the cabinet-door hangers.

These are the recommended starting settings for the functional parts:

Functional prints often need more strength than ordinary decorative models, so it is worth checking these settings rather than relying automatically on a slicer’s default profile.

The Result

This started with a very ordinary need: I wanted a small garbage bin in a useful location. As often happens, the interesting part was working through all the details that turn the basic object into something pleasant to use.

The removable bin and handle make emptying easy. The alternative mounts make installation flexible. Most importantly, the balanced flap gives the bin a simple automatic action without electronics, springs or a complicated linkage.

Download the Logical Wall Bin on Thangs

If you print one, I would be interested to hear where you install it and how you use it. You can reach me at logicalplanet3d@gmail.com, or follow the LogicalPlanet community links at logicalplanet.com.

The post Logical Wall Bin — A Compact, Removable Bin That Opens Itself first appeared on logicalplanet.

I really, really liked the earlier versions of this locking mechanism.

The original Logical CardLock Case was thin and compact—essentially a reusable, lockable replacement for an envelope. It worked well for presenting a gift card, cash or perhaps a clue in a treasure hunt.

But as much as I liked those designs, they were still basically skinny boxes. The mechanism was fun, but the limited space inside restricted what you could actually do with it.

That led to a fairly obvious question: what if I turned it into a proper box?

Download the Logical Lock Box on Thangs

The Same Idea, Made More Useful

The result is the Logical Lock Box.

It uses the same basic mechanical idea I liked so much in the earlier designs, but now there is a genuinely useful storage compartment beneath it. That makes it much better suited to use as a puzzle box, gift box, keepsake box or simply a fun place to hide something.

The new version also expands the lock from three digits to four, giving it a more substantial mechanism and many more possible combinations.

Why I Like This Mechanism So Much

I love this locking mechanism. It is simple, programmable and super fun.

Each numbered dial controls the position of a locking gear. When the correct four-digit combination is entered, openings in the gears align with the compliant tumblers and allow the latch to slide.

If even one dial is wrong, the corresponding tumbler blocks the latch and keeps the box closed.

There are no metal springs, screws or electronic components involved. The spring action comes from compliant elements printed directly into the mechanism, and even the detents that give the dials their satisfying indexed movement are printed as part of the design.

Everything is 3D printed.

Putting the Mechanism on Display

Normally, the workings of a combination lock are hidden inside its case. With this design, I decided they should be part of the experience.

The clear cover leaves the gears and tumblers visible as the dials are turned. I find mechanical designs much more interesting when you can actually see what is happening inside them, and this one is particularly satisfying to watch.

Some strategic masking helps hide the parts of the gears that would make the combination too easy to identify, while still leaving most of the mechanism on display.

Set Your Own Combination

The four-digit code is determined by how the numbered dials are positioned relative to their locking gears during assembly.

That means you can choose your own combination rather than being stuck with one I selected. You can also open the mechanism and change the code again later.

Once the correct combination is entered, the latch can be moved and the lid opened. Enter the wrong combination and the tumblers prevent the latch from moving.

A Completely Printed Mechanical Build

The body, lid and hinge print together, while the dials, gears and latch components are installed afterward. The completed lock assembly then snaps onto the box without glue, screws or additional hardware.

Even the temporary support beneath the lock mechanism is printed as part of the project and removed once it has done its job.

The finished box measures approximately 6.69 × 2.87 × 1.75 inches. It provides substantially more usable space than the earlier CardLock Case while keeping the mechanism as the main visual feature.

Assembly and Programming

There is some assembly involved, but I think that is part of what makes this design enjoyable. It feels more like building a small mechanical device than simply printing another container.

The lock components are installed in sequence, and the combination is programmed by setting the relationship between each numbered dial and its locking gear.

The illustrated instructions included with the model walk through the complete process.

Once assembled, enter the correct code, slide the latch and lift the lid.

Then hand it to someone else without telling them the combination.

Printing the Logical Lock Box

As with most functional prints, the slicer settings matter. The gears, compliant elements, hinge and snap connections all depend on the parts having enough strength and dimensional accuracy to work properly.

I have included the recommended slicer settings with the model rather than relying on typical default settings intended for decorative prints.

Download the Logical Lock Box

The model files, print settings and complete illustrated assembly instructions are available on Thangs:

Download the Logical Lock Box on Thangs

If you print one, I would love to see the colour combination you choose and hear what you use it for.

I still enjoy this mechanism enough that the Logical Lock Box may not be its final form.

The post Logical Lock Box first appeared on logicalplanet.

Download the Logical Modular Planter System on Thangs

This project started because I wanted to grow jalapeños so I could make my own chipotles. The best growing area around my house is the front yard, where I get plenty of sun—but I didn’t have any actual garden space there.

A planter seemed like the obvious solution, but most available designs locked me into one particular size. That felt like an opportunity to do something better: design a planter made from printable sections that could be extended to suit the available space.

The planter is assembled from two end sections with as many repeating middle sections as needed. Each section is 240 mm high and 210 mm from front to back. A planter made from the two end sections is approximately 480 mm long, with additional middle sections extending it to approximately 720, 960, 1200 mm, or beyond.

A genuinely modular planter

Each section slides together and is secured using a separate 3D-printed connector at each joint. The planter sections and connectors interlock to form one structural planter without screws, bolts, or other non-printed hardware.

This lets me build the planter to suit the available space instead of trying to make the available space fit a standard planter. The sections can also be separated again if the planter needs to be disassembled.

The connector includes an embedded compliant latch that prevents the joined sections from sliding apart once it is engaged. To separate them, the latch can be depressed through the access slot using a small flat screwdriver or similar tool.

Designed with the plants in mind

The ribs add strength to the walls while encouraging roots to grow downward rather than circle around the inside of the planter. Internal drainage openings allow excess water to move through the joined sections and help prevent waterlogging.

The finished planter remains 240 mm high and 210 mm deep regardless of its length.

Printed in sections—by design

A planter longer than the printer’s build plate would normally need to be split and permanently joined afterward. In this case, the division into printable sections is an intentional part of the finished product. Each section is designed to fit on a 250 mm print bed.

The joints, connectors, and repeating middle modules are not simply compromises made to fit the parts on a printer. They are what make the planter adjustable and expandable.

That was the part of this project I found most interesting: creating something that is not merely printable in sections, but actually becomes more useful because it is sectional.

A few important printing notes

The planter shown here was printed in ASA because it was intended to remain outdoors. ASA is strongly recommended for outdoor use; PETG may be an alternative for printers that cannot print ASA.

The walls are intentionally thin to limit the total material required. The model includes removable print-support sections, so additional slicer-generated supports should not be added.

Because the tall, thin walls become increasingly vulnerable to vibration as the print progresses, the supplied slow-down-by-height settings are important. The settings I used begin slowing at 180 mm and transition through to 250 mm.

The complete recommended print and slicer settings are shown below and are also included with the model documentation.

Build it for your space

You can start with the two end sections and add middle sections until the planter reaches the length you need. This makes it useful for spaces where an ordinary fixed-size planter would be too short, too long, or simply awkward.

The complete model, printable components, and assembly information are available on Thangs:

Download the Logical Modular Planter System on Thangs

If you print one, I would be interested to see how long you make it and where you use it. You can share a make on Thangs or join the LogicalPlanet community through the links below.

LogicalPlanet community and social links

Questions, comments, or suggested improvements can also be sent to logicalplanet3d@gmail.com.

The post The Logical Modular Planter System first appeared on logicalplanet.

Click here to download STL (Affiliate Link)

Overview

CollarPod is a compact, single-piece flexible bag holder that clips directly onto your dog’s collar so a bag is always there when you need it — even on those walks where you forgot your jacket, your bags, or just your brain. Printed in TPU, it flexes to clip on without any tools and stays put all day.

What It Is & How It Works

1. Flex the back of the pod over the collar edge — TPU flexibility makes installation easy without removing the collar.
2. Fold a standard poop bag tightly — lengthwise four times, then once across. Keep air out for the most compact fold.
3. Close the lid and press until the side tabs click. CollarPod is designed to be firm enough to open that it won’t accidentally pop open on the walk.
4. Check the viewing window before each walk — bag visible means you’re ready to go.

Key Parts & Mechanisms

• Collar clip — flexible TPU grip that flexes onto the collar without tools and holds firm during use
• Lid with side-tab latches — snaps closed securely; firm enough that it won’t pop open accidentally
• Viewing window — confirms a bag is loaded at a glance, no need to open the lid before each walk
• Single-piece design — no assembly, no loose parts, nothing to misplace

Printing Notes & Recommended Settings

• Material: TPU 95A or similar — Bambu TPU for AMS works well
• Nozzle: 0.4 mm
• Layer Height: 0.2 mm
• Walls: 4 (1.6 mm)
• Infill: 40% Cubic
• Support: None required
• Print on a single direct-feed spool for best TPU results

Post-Print Setup

No major post-print work needed. Once off the bed:

1. Open and close the lid a few times to seat the latches — TPU may be slightly stiff fresh off the printer.
2. Flex the collar clip open and snap it onto your dog’s collar. It seats firmly without removing the collar.
3. Load a folded poop bag, close the lid, and you’re done.

Available Sizes

CollarPod is available in three sizes to fit common collar widths, plus a BeltPod variant for humans:

• CollarPod 17 — fits 5/8″ (17 mm) collars → Download on Thangs
• CollarPod 26 — fits 1″ (26 mm) collars → Download on Thangs
• CollarPod 40 — fits 1.5″ (40 mm) collars → Download on Thangs
• BeltPod 40 — clips to your belt (up to 1.5″ wide) → Download on Thangs

Measure your collar or belt before printing. If you’re between sizes, go with the larger variant.

Why This Design Exists

Designed and field-tested in Vancouver, BC — with Bob and Heidi. Because a bag on the dog is always better than a bag you forgot at home.

Where to Get My STL Files

All my designs are available on Thangs.com.

Use, Licensing, Comments and Feedback

Some of my designs are only available for free for 1 week from when first posted, so please download them when you see a new file available that you are interested in. Also, please like and save the file too as it helps with my ratings.

I do not permit the use of my designs for commercial purposes (i.e. you can not sell my design(s) or products printed from my design(s)) without first acquiring a commercial license from me. On Thangs.com I offer membership accounts for access to all my design files as well as a membership for commercial licensing which allows subscribers to sell printed products using my designs.

I welcome comments and feedback as well as requests for customization of designs. I will do my best to accommodate reasonable requests.

The post CollarPod – Poop Bag Holder for Dog’s Collar first appeared on logicalplanet.

Download Scraper A (Affiliate Link)
Download Scraper B (Affiliate Link)

Overview

A better scraper for 3D printing beds — no screws, no stripped holes, no fuss. The Logical Scraper series solves the two biggest problems with printed scraper handles: stripped fastener holes and multi-piece assembly. Both models use a tool-free design and accept standard 32 mm × 23 mm scraper blades.

What It Is & How It Works

Model A — 2 Piece, Adjustable Angle

The engineer’s scraper. Model A is a two-piece snap-together design with five interchangeable blade holders at angles of 12, 13, 14, 15, and 16 degrees. The handle and blade holder click together using printed hooks and a positive index feature that confirms the holder is fully seated before use.

• 2 pieces — handle + interchangeable blade holder
• 5 blade angle options: 12, 13, 14, 15, 16 degrees
• No screws — snap-together only
• Blade holders swap without tools
• Positive index confirms full seating

Model B — 1 Piece, No Assembly

The minimalist’s answer. One piece. Print it. Install the blade. Done. After designing Model A, I challenged myself to eliminate assembly entirely — no hooks, no indexing, no sliding parts. The blade wedges directly into the handle, and an inspection window lets you confirm full seating before you put it to work. Selectable blade angles are four separate variants: 13, 14, 15, and 16 degrees, with the angle embossed on the handle so you always know which one you’re holding.

• 1 piece — handle and blade holder are a single printed part
• 4 blade angle options: 13, 14, 15, 16 degrees
• No screws — blade installs directly into the printed slot
• Inspection window confirms blade is fully seated
• Angle embossed on handle — always know which variant you’re holding

Key Parts & Mechanisms

• Blade slot — precision-fit channel sized for standard 32 mm × 23 mm scraper blades
• Snap hooks (Model A) — printed hook-and-index system; positive click confirms full seating
• Inspection window (Model B) — confirms blade is fully inserted before use
• Embossed angle label (Model B) — angle is cast into the handle so you never guess which variant you’re holding
• No screws — no stripped holes, ever

Which Angle Should I Print?

I’ve tried them all and find 15 degrees to be the sweet spot for most print removal tasks — but your preference may vary depending on your bed surface and material. Start with 15° and experiment from there.

Printing Notes & Recommended Settings

• Material: PETG recommended; PLA also works
• Nozzle: 0.4 mm
• Layer Height: 0.2 mm
• Walls: 4 (1.6 mm)
• Infill: 40%
• Support: None required
• Print Orientation: As per the included 3MF/STL files

Post-Print Setup — Blade Installation

The scraper blade is extremely sharp and capable of causing serious injury. Handle the blade with pliers only — never bare hands.

For Model A: snap the blade holder into the handle until you feel the index click, then use pliers to press the blade firmly into the holder slot until it seats fully.

For Model B: use pliers to press the blade into the slot from the open end. Check through the inspection window to confirm the blade tip is fully seated before use.

Where to Get My STL Files

All my designs are available on Thangs.com.

Use, Licensing, Comments and Feedback

Some of my designs are only available for free for 1 week from when first posted, so please download them when you see a new file available that you are interested in. Also, please like and save the file too as it helps with my ratings.

I do not permit the use of my designs for commercial purposes (i.e. you can not sell my design(s) or products printed from my design(s)) without first acquiring a commercial license from me. On Thangs.com I offer membership accounts for access to all my design files as well as a membership for commercial licensing which allows subscribers to sell printed products using my designs.

I welcome comments and feedback as well as requests for customization of designs. I will do my best to accommodate reasonable requests.

The post Logical Scraper – 3D Printed Bed Scraper (Model A & B) first appeared on logicalplanet.

I like to grow herbs and vegetables for cooking, and this year I am adding Thai peppers and jalapenos. My plan is to smoke the jalapenos to make chipoltes. I can’t wait, but I need to get an early start on these peppers in our colder climate. And, so I have created an indoor seed starting and growing platform. Later, I will ty to use this for growing some herbs indoors, and I will also apply some of my hydroponic experience to make an insert for hydroponic growing.

Click here to download STL (Affiliate Link)

Every growing season I found myself juggling trays, heat mats, lights balanced on boxes, and awkward height adjustments as seedlings shot up faster than expected. It worked — but it was messy, unstable, and never quite dialed in.

The Logical Grow Platform (LGP) was designed to solve that problem in a clean, modular, fully printable way.

Instead of building a temporary setup every spring, the LGP creates a dedicated growing platform that holds your seed trays, integrates optional bottom heat, supports a common LED grow panel, and adjusts smoothly as your plants grow — all while staying compact enough to print on a standard 250mm bed.

It’s a system meant to grow with you, not something you outgrow in two weeks.

What It Is & How It Works

At its core, the LGP is a snap-together main body that holds seed starting trays inside a raised platform, with two adjustable threaded posts that support a removable light hood above.

The hood holds a standard aluminum LED grow panel, while the base can optionally house a low-power reptile-style heater for bottom warmth during germination.

As seedlings emerge and stretch upward, you simply rotate the posts to raise the light — keeping an optimal distance without stacking books or rebuilding your setup.

Everything is modular:

• Trays drop in and swap out easily
• The hood lifts off instantly for watering or transplanting
• Height adjusts smoothly with precise control

Key Parts & Mechanisms

The LGP is built around a few carefully designed functional elements.

Snap-Together Main Body
The base assembles from interlocking pieces using tongue-and-groove joints and internal latches. It locks rigidly while still allowing disassembly if needed.

Adjustable Threaded Posts
Each post raises or lowers the hood smoothly with every rotation — about 6mm (roughly 1/4”) per turn.

An extended grip rib acts as a visual rotation marker so you can keep the hood perfectly level if you want precise alignment.

The posts can also be printed mirrored if you prefer counter-rotating motion instead of both turning the same direction.

Two-Piece Snap Hood
The hood prints in two identical halves that slide together over the LED panel and lock underneath with printed clips — no hardware required.

Integrated Cable Strain Relief
Both the hood and base include built-in cord management points to protect and route power cables cleanly.

Size & Dimensions

Despite being a complete growing platform, the LGP stays compact enough for shelves, desks, and indoor grow spaces.

The footprint is roughly 445mm long by 180mm wide, with height adjustable from about 175mm up to nearly 390mm depending on post position.

It comfortably fits multiple Logical Grow trays while remaining stable and easy to move.

Printing Notes & Recommended Settings

The Logical Grow Platform is designed as a functional print — strength matters more than cosmetic perfection.

Recommended settings focus on durability:

• 0.4mm nozzle
• 0.2mm layer height
• Thick walls and solid top/bottom layers
• 40% cubic infill for general use or 100% for maximum longevity

PLA works well for indoor use, while PETG or ASA are ideal for higher heat or long-term durability.

Everything prints support-free in strength-optimized orientations.

Post-Print Setup & Motion Release

Because the adjustable posts are printed with tight tolerances to eliminate wobble, they may need a quick break-in.

This is done by gently squeezing or tapping the post sections, then fully extending and retracting them once or twice until motion becomes smooth.

An included Post Tool acts as a small wrench to help rotate the internal elements if needed.

Once loosened, the movement becomes effortless and precise.

Assembly

Assembly is entirely snap-fit — no screws, glue, or hardware required.

Main Body
The end pieces slide into the center section and click into place using built-in latches.
If the bottom tongue-and-groove features don’t perfectly self-align, a gentle flex will seat them flush.

Adjustable Posts
Prepared posts press into the connectors in each end of the base and snap securely.

Hood
The two hood halves slide onto the LED panel and lock together underneath using printed clips.

The hood then rests directly on the adjustable posts for quick removal.

Everyday Use & Operation

Using the LGP quickly becomes second nature.

Start seeds in your trays, drop them into the base, and optionally add bottom heat for faster germination.

Once sprouts appear, lower the hood close to the seedlings for strong early growth. As plants stretch, rotate the posts to raise the light smoothly.

The hood lifts off instantly for watering, thinning, or transplanting.

Everything stays organized, stable, and perfectly positioned through every growth stage.

Why This Design Exists

The Logical Grow Platform was created to replace the unstable pile-of-stuff grow setups most of us end up using.

It’s about:

• Clean organization
• Smooth mechanical adjustment
• Modular expansion
• Turning seed starting into a proper system

It also forms the foundation of the broader Logical Grow ecosystem — with interchangeable trays, accessories like filling funnels and reusable plant markers, and future modules designed to scale from germination through indoor growing.

Like all LogicalPlanet designs, it’s built to be practical, durable, and satisfying to use.

The post Logical Grow Platform (LGP) first appeared on logicalplanet.

Every growing season seems to start the same way — stacks of flimsy plastic seed trays, soil everywhere, seedlings sitting in soggy bottoms, and roots already circling before the plants are even ready to move outside.

Click here to download STL (Affiliate Link)

Most seed-starting systems are designed to be cheap and disposable, not to actually support strong early plant development.

These deep cell plug trays were designed to change that.

Instead of shallow cups and messy watering, they create a controlled, clean growing environment that promotes healthy root growth, proper drainage, and easy transplanting — all in reusable modular sizes that scale from small test batches to larger planting runs.

Whether you’re starting a few peppers or filling a full shelf with seedlings, the 2×3, 2×5, and 3×5 trays provide the same optimized growing conditions in flexible footprints.

What It Is & How It Works

Each plug tray is built as a complete propagation system focused on moisture control, airflow, and root health.

Deep growing cells give seedlings room to develop strong early root systems while maintaining excellent drainage. A translucent humidity dome traps warmth and moisture during germination, while built-in micro-vent spaces allow controlled airflow to prevent stagnant conditions.

The cells sit in a raised propagation tray that creates an airflow and drainage gap underneath. This enables clean bottom watering, prevents water buildup, and works perfectly with seed heat mats for faster germination.

Together, these elements form a compact micro-environment that encourages quicker sprouting, healthier growth, and far less mess.

Key Parts & Mechanisms

Each tray size uses the same thoughtfully engineered components:

Deep Plug Cells
Tall growing chambers with internal root-guiding ribs that direct roots downward rather than spiraling, creating dense, compact root plugs that transplant cleanly.

Push-Up Ejectors
Removable bases inside each cell allow the entire soil plug and plant to be lifted out gently — no pulling or root damage. Drainage holes in the ejectors prevent oversaturation and support bottom watering.

Raised Propagation Tray
A rigid support tray that holds the cells aligned while creating airflow and drainage underneath to keep roots healthy and soil properly aerated.

Humidity Dome
A translucent cover that maintains high humidity for germination while passive vent spaces provide controlled airflow for healthier early growth.

Size & Dimensions

The deep cell plug trays are available in three modular formats:

2×3 Tray — 6 cells
Great for small batches, specialty seeds, or limited space.

2×5 Tray — 10 cells
A balanced size for moderate planting runs.

3×5 Tray — 15 cells
Ideal for larger starts when prepping full gardens.

Each cell features approximately 60mm of growing depth, making them especially well suited for:

• peppers and tomatoes
• herbs and flowers
• seedlings that benefit from strong root systems

The deeper design allows plants to remain in the trays longer before transplanting while building healthier roots than shallow starter trays.

Printing Notes & Recommended Settings

All components are designed to print easily using common filaments and standard slicer settings.

PLA works perfectly for indoor growing. For longer-term durability or higher humidity environments, PETG or ASA are excellent options.

Recommended baseline settings:

• 0.4mm nozzle
• 0.2mm layer height
• 4 walls
• 5 top/bottom layers
• 30–40% infill
• No supports required

The geometry is forgiving and optimized for strong, clean prints.

Post-Print Setup & Motion Release

Very little post-processing is required.

After printing:

• Gently flex each ejector base to ensure smooth movement
• Clear any minor stringing around drainage holes
• Test the push-up action once or twice

Once done, the trays are ready to fill and plant.

Assembly (If Required)

No assembly is required.

The plug cells drop directly into the propagation tray, ejectors slide into place, and the humidity dome rests on top.

Everything is designed as a simple modular drop-in system for easy cleaning and long-term reuse.

Everyday Use & Operation

The workflow is clean and straightforward:

• Pre-moisten potting mix
• Fill each cell (a single-cell soil funnel is included for mess-free filling)
• Sow seeds and lightly cover
• Place the humidity dome on top for germination
• Bottom water as needed
• Remove dome once seedlings emerge
• Push up ejectors to transplant cleanly when ready

Reusable plant markers designed for standard 12mm × 40mm labels (such as Nimbot-style labels) — or simple handwritten notes — make tracking varieties easy throughout the growing process.

Everything stays organized, clean, and frustration-free.

Why This Design Exists

These plug trays were created to replace disposable seed starters with a reusable, well-engineered system that actually supports plant health.

Instead of dealing with warped plastic, soggy soil, and weak roots, the focus is on:

• controlled moisture
• healthy airflow
• strong root structure
• clean transplanting
• modular scalability

They also form the foundation of a larger modular growing ecosystem that will continue to expand over time — allowing seed starting to integrate seamlessly into larger indoor growing setups.

For now, these trays offer a simple, professional-grade way to start stronger plants at home.

The post Deep Cell Plug Trays – Seed Starters first appeared on logicalplanet.

Phones tend to end up flat on a desk while we work — off to the side, face down, or constantly being picked up just to check notifications, timers, or reference content. Over time they add clutter and break focus, even though we rely on them all day.

Click here to download STL (Affiliate Link)

Overview

STEPH was designed to give your phone a natural home while working — up at eye level, out of the way, and always within easy view. By using the top edge of a screen, it keeps desks clear while making your phone more accessible than ever.

What It Is & How It Works

STEPH is a compact, 3D-printed, print-in-place phone holder that mounts directly on the top edge of laptops, flat monitors, and tablets.

When deployed, it securely supports your phone at a comfortable viewing angle. When not in use, it folds down into a slim, pocket-sized form that can be stored in a bag, drawer, or desk organizer. It can also be used as a small desktop phone stand when screen mounting isn’t needed.

Everything prints as a single assembled piece — no hardware, fasteners, or post-assembly required.

Key Parts & Mechanisms

STEPH is built around a set of compliant, indexed mechanical joints that allow smooth motion while holding firmly in place.

The upper support arm holds the phone securely, while the lower mounting arm hooks over the top edge of the screen and braces gently against the back for stability. The indexed joints provide defined angle positions so the phone doesn’t drift or wobble over time.

Fine adjustment features allow STEPH to accommodate different phone thicknesses — with or without a case — as well as small viewing angle changes for comfort.

Size & Dimensions

One of the main goals with STEPH was to keep it as compact as possible without sacrificing strength or usability.

When folded, it collapses into a slim, pocket-sized form that takes up very little space. Compared to the original Phone Multi Widget, STEPH is significantly smaller while remaining highly functional.

This makes it easy to keep in a laptop bag, drawer, or desk organizer when not in use.

Printing Notes & Recommended Settings

STEPH is a high-precision print-in-place design and benefits from a well-tuned, properly calibrated printer.

It prints in the provided orientation with no supports required. Proper first-layer adhesion and clean extrusion help ensure the compliant joints move freely after printing.

Recommended slicer settings are shown in the accompanying documentation images.

Post-Print Setup & Motion Release

Once printed, STEPH may feel stiff at first — which is intentional for long-term firmness.

Gently flex each joint through its full range of motion to free the compliant areas. Light, controlled movement will release any minor bonding between layers and allow the joints to move smoothly.

After a few cycles, STEPH will settle into a smooth, firm, and satisfying motion.

Assembly (If Required)

STEPH is a true print-in-place design.

No assembly, hardware, adhesives, or fasteners are required. Once the joints are freed, it is ready to use straight off the printer.

Everyday Use & Operation

STEPH is designed for everyday workspaces where phones are constantly checked but don’t have a natural place to sit.

Mounted on the top edge of a screen, it keeps your phone:

• comfortably within your line of sight
• easy to glance at without breaking focus
• off your desk and out of the way

It works especially well for notifications, video calls, timers, reference content, tutorials, and media playback.

When not needed, it folds flat in seconds.

Why This Design Exists

STEPH was created to solve a small but constant workspace annoyance — phones rarely have a good place to live while working.

Rather than adding another desk accessory, STEPH uses space that normally goes unused and turns it into something functional.

Like the original Phone Multi Widget, STEPH follows a satisfying kinetic mechanical design philosophy that transforms from compact to functional through clever motion. Where the Phone Multi Widget explored versatility across many environments, STEPH refines that idea into a simpler, purpose-built tool for modern screens and workspaces.

Together, they represent a continuing focus on compact, mechanically clever designs that make everyday life a little more organized and enjoyable.

The post STEPH – Screen Top Edge Phone Holder first appeared on logicalplanet.