Just a tiny cylinder that I flared out at the bottom to give the signature shotgun shell shape. Did a color change after a couple layers to make it look more realistic. Again, print at 103%-105% for best results. I designed the bottom of the shell to be large enough for the minifig to hold; let me know if the main part of the shell (In my case, the red part) should be what the minifig holds on to.
LEGO_shotgun_shell.stl | 87.4KB |