So, the plastic toycaps are useless as a primers. They are bad even for design testing. Easy pierced by the firing pin and often seize the pin, preventing further functioning of the system.

But.

What do you guys think about 3dp primers? I just started to play with, and they looks promising.

Printed of non-filled Nylon. Primer compound taken from 2x toycaps. Pressed with bamboo chopstick and closed with paper disk (from toycap as well).

The primer and the prime pocket have a small 1 degree reverse cone to preventing falling out of the primer.

Thickness of the primer’s top is ~1.3mm.

This bangs pretty loud. Tho not all bangs from first strike, but I’m still working on the anvil displacement.

The firing pin makes very small notch at the primer face, no other damage noticed. So I think the caps could be reused several times.

I doubt this will work in a semi/auto systems. But in a bolters and revolvers could work.