Trying to use the Eleksmaker stock rotary. I do have a Black and Blue 32bit board, no stepper/gear/belt mods. Having trouble working out what to put in the rotary setup screen, in Lightburn, for mm per rotation. I put 13mm for the roller diameter and my part (cardboard tube) is 73mm. I get very weird burns that end up going around the whole circumference (part of that may be slippage). If I turn off rotary and just do a simple square, with the rotary device plugged into one of the Y-axis ports, it pretty much works, until I try something more elaborate, then it gets crazy again.