Weird groaning noise on Z axis  

Please click on "IMG_9001" for the video...  Thanks

Here's the video: 

Z axis

make sure that the trapezoidal nut under the X-axis assembly is not to tight, maybe loosen a bit then run the Z-axis up and down and hand tighten again, had the same issue.

You are referring to the black collar/sleeve looking thing screwed (2 x M3 screws) to the bottom of the orange XZ motor drive assembly that travels up and down the Z axis?  

Yes

yes, that's the one, i had the same issue, its very easy to over tighten this.

Z

Abacabie is definitely correct, mine did the same thing and I had to loosen one of those two screws. One was very tight while the other was loose.

Thanks for your help, I have loosened the two bolts and re-tightened lightly, no more groaning noise while performing Z-axis self test.

Worked for me as well

Thanks for the tip, my pre-assembled Mini+ also had this noise when moving down, and loosening/hand tightening the two nuts underneath has resolved it

Posted by: @abacabie

make sure that the trapezoidal nut under the X-axis assembly is not to tight, maybe loosen a bit then run the Z-axis up and down and hand tighten again, had the same issue.