This is probably the simplest utility knife possible. I designed it to be both one handed in operation and require ZERO supports. This also fits perfectly in the new Sidekick Wallet I designed in collaboration with Lochby.
You may use this file in any way you see fit, print it yourself, sell them even! HOWEVER, DONT FORGET TO CREDIT the original designer (Maxlvledc). Otherwise, 10 years of bad luck will befall you!