CR-10 X Idler Shim

thingiverse

I had noticed that my CR-10's x-axis belt was running off track - the main issue being the idler, which was skewed off-center and forcing the belt to veer towards the back of the machine instead of tracking through the center of the x-axis bar. Taking a close look at the situation, as seen in the first picture, it became clear that the problem lay with the idler itself. The belt was pressed firmly against one side of the idler, leaving no room to adjust its position and get it centered properly. To fix this issue, I decided to create a shim that would fit between the idler bracket and the x-axis bar. This solution is shown in the second picture. When placed between the bracket and the x-axis, the shim brought the idler back into alignment, centering both the idler and the belt - as seen in the third picture. I've included a Fusion 360 file for anyone who wants to create their own shim to fit their specific needs.