Can I suggest you might be having a hardware issue? You might not. My first Glowforge had what appears to be the same issue… waviness in the y axis. To confirm the issue I was having, I simply generated 5 straight vertical lines and 5 straight horizontal lines in Illustrator, maybe 10 pixels thick, then engraved them onto some Proofgrade material. It was clear the vertical lines wavered while the horizontal appeared very straight. They replaced my unit because of it. You might want to post this image in a new topic on Problems & Support. If you do, you may also want to do a simple line test on Proofgrade to help Support identify such an issue.
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