CR-10S Z-axis problems

thingiverse

I recently acquired a Creality CR-10S 3D printer that performed flawlessly straight out of the box, until about halfway through its initial prints, when I encountered some issues with the Z-axis functionality. Specifically, the left Z motor would sporadically seize up, causing it to vibrate excessively while the right Z motor continued to operate normally. This led to a severe loss of levelness in the entire X-axis assembly. To diagnose the problem, I decided to dismantle the entire Z-axis system and conduct a thorough inspection. Upon disassembly, everything appeared to be in order until I noticed that both spring couplings connecting the motors to their respective lead screws were mismatched. One coupling was slightly shorter and wider than the other, causing it to fit snugly over the motor shaft, while its counterpart did not. It's highly likely that this discrepancy is the root cause of the intermittent jamming experienced by one motor. I don't possess the original 3D model file for my printer; instead, I needed to upload a generic 3D file to Thingiverse in order to meet their publishing requirements, as they necessitate a valid 3D file for public posting. However, I'm still learning the ins and outs of 3D printing and AutoCAD, so I don't have any personal 3D files to share at this time.