I recently purchased a K50 (50 watt laser) and I get an error at the extremes of the travel when I try to cut something large. Before it even starts it says, Frame Slop Error, hit enter to continue, or escape to stop.
i suspect this is an error message that needs some more work.
i have seen this when i have objects really near the edge of the maximum bed size.
i move them away from the edge and the “slop” error goes away.
yesterday i had a similar error when engraving very near the origin of the bed … i had the scan speed set very high, and the error went away when i lowered the scan speed. this would be due to the over-run which allows for deceleration of the cutting head.