A shotgun shell shot glass! Holds 40ml filled to the brim. Not much more to it, print them and let me know how they turned out!
There's two variants, a single print one and the other with separate shell and brass head for more realistic looks. Glue the two halves together with cyanoacrylate or epoxy!
Please take in to consideration the suitability of your filament in products in contact with human consumables.
Toss a like, post a make and maybe follow me over at the IG's or YT