Use by pionier soldiers in WWII, the gluhzunder 28 would contain a small tube that connected and sealed the detonator. This version would've been made of bakelite and could use either a timed fuse or electrical explosion. The smaller threaded end would screw into a 1kg, 3kg, or any explosive.

Bambulabs

Bambu P1S

No

Yes

15%

I prefer to print my layer heights as .16. Use a concentric or whatever kind of circular pattern for the first layer to make a cleaner peel off the threads.