To adjust the tension of the black belt located on the gantry, you can first loosen off these 2 bolts (or take them out):
From there, you can adjust tension of the belt by screwing these bolts in, or loosening them:
The black belt is held in by being pinched between 2 pieces of the aluminum belt housing:
If your belt has come out of the black belt holder, you can take out these 2 bolts and put the belt back into the pinch piece:
To tension the belt back up again, screw these bolts back into the laser head gantry assembly. Tension them until they start feeling snug. The black belt should have tension when you push it with your finger:
Once you have tensioned the belt, tighten the bolts that hold it to the laser head gantry assembly:
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