My Cheapo Chineese 3020t mini CNC Build (more like improvements) leanring all the way

[ravihotwok]

A common problem with this model of cnc machine is excess play on the z axis, this is caused by a small gap from the top of the screw and the bearing just where it meets the motor. It is only about 1.5mm but is enough to worry you. Using a 3d printed washer I have solved this problem and now there is zero play in the z axis, got the idea from a funny chap off youtube.

Here is the excess play before
https://www.youtube.com/watch?v=r9aK...ature=youtu.be

Here is how I solved it:
I started with printing some washers
8mm id 11mm od 2mm thickness


Now to remove the motor, and then the 2 retaining screws on top of the bearing


Now slide the printed washer onto the screw


Now install the bearing again, you must make sure that the bearing is flush with the top of the housing it is seated in, I had to sand about half a mm off to achieve this, once happy tighten the 2 retaining screws and then install the motor.

Here is the result
https://www.youtube.com/watch?v=YBEN...ature=youtu.be

No play at all and the axis still moves nice and freely. An easy fix to what really should of been sorted at factory.

Hope this helps someone in the future :-)