To prevent spent primers jumping all over the place, you can insert these fillers into the slot of the ram of your RCBS press. Both have the same function, the T-shaped one comes out with the shell holder, the other one can stay in the ram while replacing shell holders.
I print these upright, flat side down, with 60% infill, support only from the build plate (not in the gap of the filler).
NO COMMERCIAL USE!
The author marked this model as their own original creation.