Vertical lines in filled shapes depending on speed

First time on the forum… I’m using Lightburn with a jtech 4.2w on a Xcarve CNC. As the speed decreases to 160ipm and below, vertical lines begin appearing in the fill, increasing in frequency as the speed lowers. Occurs across several wood/material types.

Are there settings within LB that I should look at it is this a laser, power, or machine issue? Thanks

It’s most likely vibration induced from the motion system, possibly the belts. Check your belt tension on the X axis - if it’s too tight, or too loose, the belt teeth interacting with the pinion can cause vibration (the effect is sometimes called “curtains” on big CO2 systems). It could also be the laser itself vibrating from debris on the rails, so that’s worth looking at as well.

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