Back for another trip! This time I engrave some plastic stemless wine glasses I picked up for cheap. Settings and results (which were amazing once dialed in) below!
You may have noticed that for all of these rotary jobs I have been preferring the Blue Lens. There is actually a reason (or two) for that. First and foremost, it allows me a little play when focusing the laser. Since the beam is the most constant with this lens, you can tolerate (read: ignore) minor imperfections and shifts in the profile of the glass. This helped a lot for this glass, because it was rather curved. Another reason is that it gets the lens head a longer clearance from the machinery. Always check your clearance (even past what you think you need) before you cut. Always.