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.
I’ve made some changes. The top of the primer made thinner, around 1mm now. Also changed anvil depth. And today I had first time when all 5 round fired from first strike.
So, I’ve printed more primers, loaded pair of. Aaand they kaboomed. While taking remnants out of primer pocket, I notices the plastic is brittle. Not like the Nylon should be. I suspect this is because I don’t let em to moisturize.
Looks like I was wrong :-) the blowing primers issue was caused by the concentric pattern of the top shell, the bottom shell and the solid infill. Note the Orcaslicer’s “Detect narrow internal solid infill” option, which could force the concentric infill despite of the “Internal solid infill pattern” setting. Yea, “999 walls” is not overall good.
Testing continues…