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M5x40 Cap Head Screw

Insert the M5x40 screw into the marked hole on the EVA3 assembly and fasten it slightly to engage with the M5 nylon locking nut

The M5x40mm screws are used to tighten the CoreXY belts

Tighten each M5x40 screw one-half turn at a time to tension the belts equally

Continue tightening the screws until the belts are no longer slack

Check that the X-axis gantry is square by moving it to the front of the machine. If it has skewed, it can be squared by adjusting the tension of one belt at a time

Make sure not to over-tension the belts as this can cause damage to the bearings, the belt, the motors or printed parts!

An excellent article on correct CoreXY belt tensioning is available on Mark Rehorst's website

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