UtiliKnucks

There's no shortage of knuck derivations on this app but none of them checked all the boxes for me so I got to work and created my own. These do require some additional hardware to complete but to me the end result was worth the extra hassle and expense. Printed at native size the finger holes measure 25mm in diameter.

Some advantages to this model vs. the majority of alternatives include a two-piece interlocking design secured with M3 hardware, this allows identical plate texturing on the top and bottom of the model and once assembled it is difficult to tell at first glance that these are 3D printed. In slicing these down the middle to achieve my aesthetic goals I realized that an unintended result of this design philosophy was that I could also integrate bolts and capture nuts to the impact face in addition to creating an attachment slot which is able to accept a standard utility blade. The blade is a completely optional addition depending on your expected use case scenario but if someone was to keep this in their vehicle as an emergency extrication device it could be used as a seatbelt cutter in addition to performing other random cutting tasks as needed.

The print profile I'm uploading runs at 100% infill, I realize that model strength hits diminishing returns once you hit certain infill thresholds but I wanted these to be as heavy as possible as well. All in you're at just over 40 grams of filament at 100% infill, I think you'll agree these feel right once printed at least in terms of what you can expect from a polymer solution. I find that PETG is a great filament for these but I have produced them with a variety of other filament types as well, it really depends on what you want to do with them.

Disclaimer- Please understand all the laws pertaining to a tool like this in your area of operation as they can vary greatly. The designer is not responsible for the way individuals utilize this tool. Please be careful, as far as 3d printed items go this is a serious piece of kit especially once a utility blade is added. Misuse can result in serious injury and beyond.

Additional hardware needed to complete the build-

7 M3*12 socket cap screws

6 M3*6 socket cap screws

13 M3 nuts, you'll need 1 per screw

Optional- 1 standard dimension utility blade. Serrated edge works great if intended as a seat belt cutter but it really depends on the application you have in mind.