Yeah, I don't think it will be long before the printed ones are a reliable as the polymer.
I thought about building an 80% lower but it was a cost issue for me. By the time you buy a nice billet 80% lower and the drilling template along with bits you could have bought a few aluminum lowers without the risk of F'ing them up.
Other than the benefits of saying "I milled my own lower" and having a completely legit untraceable AR I just don't see it. If there was a local company offering their CNC for rent I would consider it further.
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