So I just replaced all my rods with hardened steel rods along with linear ball bearings. I went to test my printer but the left Z-axis motor (near the power supply) won’t turn. It is making the noise like it is trying to turn but is getting stuck. I unplugged the right Z-axis motor and the left motor turned normally. When the right motor is plugged in again the problem re-occurs. What can cause this?
The distance of the backend of the X-ends Plates on the X rods. The end plates are acting as a lever on the bearings, and if you apply too much force the bearing will not slide. Adjusting them(distance of the two X Rods) in and out until you find the ‘happy’ point. They also need to be evenly spaced or you will put a twist on the X End Plate top to bottom.
Note: Make sure you have free travel all the way from the top of the Z Rods down to the bed plate.
Or at least that is how I have fixed it so far when I have it. YMMV.
Thanks to some times from mhackney I got it working. I followed the assembly process from this link: https://ohai.lulzbot.com/project/53cdfcb1-8647-4065-ba3a-ecc6cee7668b/
I believe the key part is leaving the bearing holders slightly loose and then tightening them once the rods are in.