12 gauge shell holder

A simple, no-frills shell holder for 10, 12 gauge shotgun shells. Designed for 2 3/4" and 3" shells, but can probably hold smaller ones just fine. Note that the holes only have 0.5mm tolerance from the SAAMI dimensions, so make sure your printer is tuned well. Your shell will only be able to be inserted up to the brass, don't force it past that.