[PLEASE NOTE THAT THIS PART IS MADE FOR THE OLD CR-10 PRINTER]
This part replaces the stock Z shaft cover that is useless as the shaft wiggles a lot, with my printer at least, affecting the Z resolution.
This piece should hold the shaft better. I left the top open so it can be greased if needed, although there is a sufficient tolerance between the inner wall and the shaft.
Update 1 Note: This update has the part with a 0.4 mm less inner ring size if the first part does not make the shaft stable enough.
The reason of the variance is that the shaft diameter is not consistent, this is why some reported that the initial part still makes the shaft wobble. My printer shaft diameter for example ranges from 8.4 to 7.8 mm from bottom to top.
If you still have an issue, please let me know.