Made this for two reasons:

1. So it fits the hand (made the body ~50mm longer
2. Has a thumb guard on top of the blade (so you can rest your thumb)

I was surprised removing the top portion of the blade cover did not prevent the cover from falling off--it has very good friction fit.

I used an M3x8 screw and nut, but a countersunk M3x6 would work better (keep everything flush--the screw does not get in the way when in use)

Printed it with 4 walls and 20% infill with PLA; nothing crazy. Will be using it to cut cardboard. The screw provides most of the strength when poking