Perhaps you don’t need a 3D printed gun, so what about going fishing: http://www.instructables.com/id/3D-Printed-Pocket-Fishing-Rod/
3D Fishing:
The Ultralight Hiker
Ultralight hiking, backpacking, bushwalking, deer hunting, canoeing, pack rafting, tips, trails, adventures, gear, reviews...Over 1600 posts & 70 years' experience.