If your looking at getting started in the world of 3D printed weapons, the 3D Printer Buying Guide is a good place to begin!
The Double Rib AR-15 Super Lower is a 3D printable lower receiver with two support ribs. It has the advantage of access to to both side of the safety hole, allowing the use of ambidextrous safety selectors. The disadvantage if the second support rib is that it will not function with uppers that have a forward assists. Slick side and side charging uppers must be used. This design includes custom support.
