Nema23 Bowden Extruder Cold End (1.75mm)

This is my Nema23 bowden extruder cold end. It' symmetric design, so the motor can mounted to the left and right sight. It uses a 4mm OD tubing. The driveing pully should have an outer diameter of 12mm. For connection to the bowden tubing the hols are met to use a thread with nominal thread size of 1/8" BSPP. I printed it in ABS and cut the thread with a thread cutters direct in the mount block. The bearing is a 6x19x6mm DIN 625. I cut a M& thread dircet in the idler block. The screw is a DIN 7991 M6x16mm gift screw. The spring holder is a M3 threaded rod. For the motor mount I used DIN 933 hex screws, the head fits in the extruder mount and can attracted from the motor side.