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Take your time with this step. It is important that it is done correctly or it can cause issues later with your printer. Do not over-tighten the bearings or you may cause permanent damage to them.

Start tightening evenly, incrementally and in turn. the M3x25 screws. While tightening, test if the bearing can rotate in the directions shown by the red arrows. When it no longer moves, in this direction, stop tightening immediately.

Check whether the bearings can slide along the slot.

If the bearing can slide: tighten evenly, incrementally and in turn, the M3x25 screws until you can't move it anymore. Do not over-tighten!

If the bearing is not moving anymore: continue to the next bearing.

Repeat this step for the two remaining bearings.

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