While these are lovely little machines, the problem almost everyone has setting up level on the CR10 is based on the lack of adjustments on the X Beam.
These replace the standard no adjustable bushings on the end carriages of the X Beam
Included is a hard to find 7.2 mm drill bit which coincidentally is the same identical size of the bushing shoulder.
This brings the quality of your prints up a couple notches and is the cheapest upgrade you can make.
Fits all the CR10 clones…