Machine: K40 w/m2nano
Board: C3D Laserboard w/Lightburn
Firmware: Problem occurs with both Smoothie and GRBL
Problem/ Question: Board was working originally, but lately when I try to cut a 16mm circle, I get an oval that’s 16mm wide and 18.5mm tall. The Y-axis is stretched for some reason. I’m cutting at 5mm/sec, so speed is not likely the issue.
Here’s the baffling part - when I position the laser head using the grid in Lightburn, the problem doesn’t occur. I moved the laser to four corners of a 20mm grid on-screen and burned a spot at each corner. The spots were exactly 20mm apart in both X and Y direction.
What would make the Y-axis move correctly during positioning, but then be stretched during a laser cut? I did check the steps/mm in lightburn and they are set the same. Happens the same with either smoothie or GRBL installed. Any ideas?