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by Mizza 3670 days ago
Not only can you already print a lower, you can print a bolt-together lower than can be printed on a commercial Makerbot or similar.

Here's a video: https://www.youtube.com/watch?v=42zpwpmGOvc

and another of it being test-fired: https://www.youtube.com/watch?v=_TXz9kb83yc