Parts to mount bowden improved with 10mm fittings Prusa 3d printer and using budaschnozzle.where is the internal diameter of the thread is 9mm, carefully turning the fitting can make the internal thread, if you can apply heat to the fitting is made much easier. It consists of two parts, one to be placed on the budaschnozzle and another to place the extruder at the top next to the Z-axis motor.