CR-7: Above Material Bobbins (need M8 thread) 上置料架

I notice that most of the CR-7 above bobbins design is one piece. The high is stationary and can not fit some of the bobbin because of the diameter.

There is a M8 screw thread for bobbin holder with CR-7 set. Use the screw thread can also save some material and time. Hope you like it.

(The picture is the testing model)

Update: I add a printing bb ball bearing. Which is 9-29-5mm that is fit to min 8m thread and 30mm internal diameter of bobbin.