Skeleton Style Utility Knife

I like knives, a lot and as a result, I have accumulated a lot of them. As part of that, I have also accumulated a lot of utility blades and I seem to never have the knife handles around for the blades. The few commercially made handles I have tend to frustrate me because they rust, break, and are often overly complex. So I created this…

https://youtu.be/17PsG62tqMs

This utility knife is basically for opening and breaking down cardboard boxes. I need one in my kitchen, by my front door, near my recycling, in my toolbox, you get the idea – I need them everywhere. So this is cheap, simple and works!

The handle is very simple and very useable but I think what makes this so functional is that the case allows you to safely store the knife in your pocket, kitchen drawer, toolbox, etcetera. And, at the same time, the case is also the tool to insert and remove blades.

I have 3 different brands of utility blades bought here in Canada and they are all the same outside dimensions and format. However, based on a quick Google search I see there are other sizes (formats) around the world so make sure the blades you have (or can get) are similar to the size I have shown here…

If you have a different size blade and can document it, I would be happy to make an adaptation of this for other blade sizes. Just send me the details.

Instructions

It is almost easy enough that no instructions are required. I mean… stick a blade in it, and replace it when it is dull! But the extreme sharpness of these utility blades means there is some caution required. So I created tools (as part of the case) that help you to insert the blade and unlock to remove the blade. Instructions for both of those scenarios are included below…

Printing

I have tried to make my main print settings visible on the Cura screenshot but in case they are difficult to read I have summarized them again here…

Material: I choose to use PETG for its durability and flexibility.

My Setup:
Nozzle = 0.4mm

My Settings:
Layer height = 0.2mm
Line width = 0.4mm
Wall count = 4 (1.6mm)
Infill = 40%
Ironing = ON

Print Orientation: As shown in the screenshot(s).

Support: None needed.

Post-Printing Notes

There is a unique design feature to the knife handle which is a turn in an unsupported run. Of course, the solution to this is “support” but the support is not conventional and does not need to be removed. The support in this case is 1 nozzle width (0.4mm) and is broken by inserting the blade the first time. You may feel it the first time the blade is inserted. After a the first blade has been fully inserted once, it will go in and out more easily after that.

Where to Get My STL Files

You can find my posted STL files on the following sites:

Thangs

Use, Licensing, Comments and Feedback

My primary distribution site for my design files is Thangs.com. Thangs is leading the way in promoting designers and competition amongst designers which in turn fuels the growth of high-quality 3d printable designs for the benefit of our entire community. The competition on Thangs, unfortunately, necessitates designers limiting the availability of free designs for a limited time. As a result, 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.

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 second membership for commercial licensing which allows subscribers to sell my printed products using my designs commercially.

I am commercializing some of my designs and printed products through various avenues including an ETSY shop, my branded site Buku Design and also on Amazon (Canada and USA).

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


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