Video instruction: https://youtu.be/X-JyLu6NTWg Screw M3: 1 - 4x20mm -- legs 2 - 6x8mm -- the ring is white 3 - 1x30mm -- Bearing 4 - 5x15mm -- bearing bushing Bearing: NSK 6203DG8A I use 50% infill and ABS plastic