I was having issues with blurry engraves and received a replacement lens.
Previous thread:
https://community.glowforge.com/t/blurry-engrave/28600/10
This didn’t fix the issue and we think it’s the pulley on the underside of the lens track, specifically the one all the way to the left, or possibly the motor at this point. After starting printing the lens shifted during printing a full inch to the right. This was during printing. . . It started to the left where the image was placed, and then about a quarter inch up from the bottom shifted to the right.