I goofed while first uploading this, Paintball mine (1) file is broken, two of the tubes are blocked off, Mine top FIXED is a fixed version, I should have fixed this sooner, I didn't realize it was the wrong file.

A paintball mine that uses both 8 and 12 gram CO2 cartridges and is also easy to print.
The lid, the part with the threads, should not be screwed on too far as it can get stuck, I am working on making a lid with tabs to easily unscrew for access to the center tube housing the CO2 cartridge. A nail goes through the bottom of the canister through the small hole, preferably one wider than the diameter of the hole. The threads may need to be broken in depending on print quality.
Refer to this instructables for and Idea of what I based the design off of and to help with assembly - https://www.instructables.com/id/Build-a-Paintball-Mine/