If you became tacticool like me this is perfect thing for you. This sheath is designed for CMMG AR conversion kit to protect it from transportation and outdoor environment. To attach it to belt or bag you can use built-in MOLLE clips. Bottom part and cap have 6mm holes in them for bungee cord or paracord for securing lid.
I've also included picatinny rail for front and adapter for sides to make it even more tacticool so you can install some scopes or bipod.
Use ABS for strong plastic weld. Supports are only required where clips connect to main body. Print clips laying flat for better layer strenght.
If your 3d printer Z height is not tall enough you can separate it intoo 2 pieces (I did this at 120 mm from the bottom)
Next glue everything using acetone
Optional: put it into acetone vapours bath - acetone will melt everything together creating one solid piece. Later let it dry for a night or two and treat it with sandpaper or steel wool for matte finish.
After that insert rubber sleeve that came with conversion and enjoy your tactical 3d printer CMMG conversion kit holster!