[BwanaNdege]

“I don’t think they’ve made it past 80 rounds with a printed lower receiver before it cracked.”

That is strictly a developmental problem. Go to greater wall thickness in the weak areas, sprinkle a few glass or Kevlar fibers between printed layers.

Lots of possible solutions.

[puppypusher]

“I don’t think they’ve made it past 80 rounds with a printed lower receiver before it cracked.”

That is strictly a developmental problem. Go to greater wall thickness in the weak areas, sprinkle a few glass or Kevlar fibers between printed layers.

Lots of possible solutions.

Try making the lower receiver out of carbon fiber or carbon nano tubes.That stuff is supposed to be stronger than steel.