utility blade holder

I am fresh out of screws, so here is a fully printable remix of the [X-Actamundo Hobby Knife](https://www.thingiverse.com/thing:17551) by CDugD. I also added a hole at the end so I can add a little loop for hanging.

Everything was designed to friction fit, but of course, that will depend on your exact printer and filament combination. You can scale the insert up or down a few percent to get a better fit.