This machine is going from the ground up, and it's still in the CADing phase. But for the real prototype, I know I'm going to be using .25" HDPE plastic, good allen screws, and NEMA 17 steppers. The frame will be CNC milled, and if not, laser cut, and I plan to have most of the pieces machinable. The printer prints with PA12 Nylon powder, and it uses a 5W diode laser, along with a galvo system to point the laser.