This is an ergonomic utility blade holder modeled to fit a standard Stanley blade. It does not need screws as the head of the holder has a small latch that bends down allowing to slide in the blades. Light duty use only.

Prints in 3 pieces as pictured and snaps together by contact, you can put a tad of glue in the holder to secure everything in place. No supports needed. Make sure you have a good first layer so that the blade holder latch does not fuse. My slicer makes a 0.5 width first layer by default so i changed it to 0.42 and the clearence is perfect. Use extra walls and over 25% infill to have a firm piece.

Update: Added 2 sheath options; lid only cover & belt clip holster;