UPDATE: Redesigned the shells. It takes much less time to print and has less weight.

not print in place, seperate them before printing

DO NOT SHOOT AT PEOPLE

there's a 2mm steel tip version, U can put a diameter 2mm nail in it

It can maintain its direction and penetrated the box on a distance of 10 meters with fully printed tip

full penetration with steel tip↓

I haven't figured out how to fix the 2 parts together yet so it can only be held in hand and put into the barrel for single shots

attaching a piece of tape to the bottom might be useful