Youtuber ioscribe shows off a fully-functioning 3D-printed Glock-pattern frame. The frame, called the Banana Standard, was printed out of PLA at 0.1mm layer heights, and is fully functional, except for an issue with the slide and recoil spring being too heavy to function when used in conjunction with a suppressor.
You can check out more of the Banana Standard, including some earlier iterations, and a 3D-printed VZ61 Skorpion frame, on ioscribe’s channel – www.youtube.com/channel/UCHdVwKz3nA_gaYXL9cEME0A