I found myself with tons of loose sleeves of primers. this holder holds 10 sleeves, (1000 primers) and supplies structure if you want to vacuum seal them, so they don't get crushed, I've tried to create this to use as little filament as possible, hence the cutouts. no supports are needed. 

the model is made for the slightly smaller GINEX primers, but slight scaling is all that's needed to fit other brands like CCI. 

there is a lid, but i found myself just printing the holder alone.