My crossfire pro was plagued with couplers that did not tighten. The small machine screws would strip out the aluminium couplers. I made sure there was no grease or debris on either the lead screw or the motor shaft, but they would not hold tight.
- I have read about people using fixes like grinding a small flat spot on the motor shaft and the lead screws. (like drill bits) I haven’t done this, but I thought I would share what someone else did.
-I fixed most of mine by just drilling out the couplers and using bigger screws; however, my Z-axis, which, as you all know, comes pre-assembled, had the same issue of the coupler not being tight enough to hold onto anything. I knew I should tighten up the screws, but I knew they would strip out. Sure enough, the first little turn made the screws strip out. The couplers are too beefy for those small threads to hold onto.
-If anyone knows where I can find a couple that works well with Z-axis, that would be great!