Just ran a coaster from dxf from solidworks. Toolpaths from estlcam. Setting are marlin as .g file with arc off, i/j off. 2 flute endmill with router between 3 and 4. 0.8 doc at 10mm/s. Still the same results. Flats on the top and bottom again. Marlin is your version rc7, only change made to to the speed, and steps changed 1/16. Will include a video, photos and code. Thanks.