Laser engraver skips a line

The engraver just skips a line. Anyone know what could be happening here?
My hope is I just need to tighten the belt. Anything I am missing??
(LaserMaster 2 Ortur 15W)

Try to measure the engraved image against the value it should be in size - you’ll see, if the line is missing or it has just an offset against the previous one. The tightening of the belt looks like probable reason.

Thanks for the idea! Ended up just being a belt issue i think. Works fine for now

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