Rotary engraving tumbler tip — fix the banding issue once and for all

If you're getting horizontal bands on your tumbler engravings, here's the fix: it's almost always your rotary roller speed not matching the linear speed. In LightBurn: go to Device Settings > Additional Settings and set "Rotary Scale" based on your tumbler's circumference. Formula: (360 / tumbler_circumference_mm). Once I got this right, zero banding.