@MrMag I’m getting great results on various tumbler brands, including Yeti, with a diode laser- Neje A40640. Biggest factor I have found is that less power yields better results when it comes to ablating powder coat off of ss, to get a shinny ss reveal. Process and laser specs here: Yeti tumbler etching - #8 by bLouChip , and see the posting it refers to for more info and pic.
Cheers,
Lou