As you can see on the picture I use a Mendel Mini extruder and I don't use a push-fit connector on the extruder to secure the ptfe tube. I needed a mount that allow me to open and close it easily to calibrate my extruder feed. The motor should snap in by first placing the bottom of the motor first gently on the bottom leap than you push the motor toward the frame and the ring on top should snap in. Be gentle or it will break. Use an high infill or you increase the possibility of the things snap when you push the motor in.