20 gauge shotshell holder
thingiverse
I engineered this holder to securely grip shells in place so they wouldn't fall out during hunting or sporting activities, but you shouldn't have to strain your fingers every time you need a shell. The holder will accommodate any length of shell (2.75"-3.5") as long as it's a 20 gauge. I recommend using a heavy brim on this part and a thin first layer to prevent the numerous "ears" from curling off the printbed when printing. Additionally, I've designed one for 12 gauge shotshells which can be found at https://www.thingiverse.com/thing:2725531
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