Hi @JJ3D,
Welcome in here.
On the UM3 there are two shafts that the head are moving along.
The shafts are press fit into the belt/shaft holder, it sounds like the "upper" shaft (across X shaft) is snapped out of the "belt/shaft (plastic) holder".
You may press them together using your fingers, you'll hear/feel when it "click" in place.
Be aver that this shaft trigger the (Y-axe) end stop switch, located (upper) inner left side.
The strange sound is due to the shaft moving rapidly up and down as it move along the X-shaft.
The shafts also appear to be crooked, not buttoned at 90 degrees straight with (the belt/shaft holder).
Note:
It appear that the (Y-axe) stop switch are located on the left side of UM3 (and right side of UMS3).
Good luck
Thanks
Torgeir
Edited by Torgeir
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