I've done 25-30 of them from at least three different companies. Chinese to US made. All engrave about the same, you DO need to have surface level. If I'm out of focus on a section, it will usually darken. Too much power probably. Two passes cleans best. But Be Very Careful cleaning these. They use PAINT, not Powder coating like cups. You WILL scratch and remove adjacent paint with anything other than soft wipe with magic eraser. I usually hit with Simple green and lightly wipe off, then rinse and dry. Don't use DNA, it will cut paint.
Woodworking, Old Tools and Shooting
Ray Fine RF-1390 Laser Ray Fine 20watt Fiber Laser
SFX 50 Watt Fiber Laser
PM2000, Delta BS, Delta sander, Powermatic 50 jointer,
Powermatic 100-12 planer, Rockwell 15-126 radial drill press
Rockwell 46-450 lathe, and 2 Walker Turner RA1100 radial saws
Jet JWS18, bandsaw Carbide Create CNC, RIA 22TCM 1911s and others