I'd sincerely recommend everyone to read his manifesto and think about it a little bit.
this post was submitted on 20 Dec 2024
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The ones I have use 3d printed frames, the fire control group and barrels are metal with 3d printed pieces for making the rifling.
All the parts that take repeated heavy abuse are reinforced with extra thickness or different infil, but by weight I'd say it's about 50/50 metal/plastic.
The 3d printed lowers are quite basic, and since they aren't designed to take a ton of stress anyway, it's not really hard to find a decent design.
All my parts are printed in pla+, and I do minimal work afterwards to make things perfect, only what is necessary for the mechanical parts to cycle properly.
I actually haven't been keeping up the last few years, I wouldn't be surprised if there are even better methods than the ones I've used.