Is there any information on Engraving on River Rocks, should I paint it first? I need help on this.
Depends on the rock. Why not throw a couple in and run some tests?
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A quick search on the forum for “river rock” yields this:
Take a minute to try the search yourself, you’ll find a lot of help already here, faster than asking for a whole new thread.
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You generally get better results the darker the mineral, more contrast.
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Here are the settings I used to engrave on grey river rocks. Maybe they will offer a place to start?
Good luck! Please share pics if you get it to work.
Welcome to the forum! 
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Thank You, did you use tape or paint or just plain rock?
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I did not tape it or paint it. I just lasered on plain rock.
I removed the bed, used a few boards to figure out the correct height, used autofocus, and hit print. The flatter the surface the better.
@PrintToLaser is correct. I’ve had the best luck using darker colored rocks.
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Thank You, I will post pictures
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Looking forward to pictures.
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Some rocks engrave well, others don’t.
Paint the ones that don’t!
Also take care when watching the engrave, laser on rock can make for a very bright spot almost like a welder.
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