I've been playing again. Some free time with my laser. My wife asked me if I could mark, engrave is probably not good description here, on a plastic box for my daughter.
Yep, polypropylene ammo box from my favorite store. Harbor Freight.
So I started on the bottom, OOPS, almost burnt thru the bottom.. Go to do better than that.
Tried again and it worked.
So I played around with some images I grabbed and some I converted.
teatime.jpg
Side Image isn't quite as good, but more the image and running it with one pass.
teatime2.jpg
Successful with 2000 speed, 50% power on my 20Watt, and 20kHz frequency. Filled with 90 degree 0.03mm spacing.
Just passing on!