This is a great topic. Thanks for posting, especially the results of the vertical engrave of an SVG.
My pre-release exhibited alternating waves in vertical engravings, as evidenced by my original founders ruler print. They were not in an alternating line series, but were spread over a number of raster lines. Evidently it was an artifact of manufacture and how the axes and their rails were fixed or something like that hardware wise.
This is definitely different and warrants some other tests by other machines on several materials to get a base line. It’s like the lines give an alternating phase here.
I’ll try the design in acrylic with different resolutions to see how it works.