Here are the settings that I used for the beer bottle caps I engraved.
S-300
P- 25
Lpi- 225 for 50 at a time.
I recommend doing less to increase the lpi.
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Great! Thanks for sharing them! 
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Beer caps, great idea for an engrave!
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can you tell me what kind of caps you used? did you buy painted ones and etch the paint off? did you use cermark? I have a big order for these but not sure I want to take the order if it cannot be done properly. Thanks!
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I believe they are anodized aluminum. The laser burns off the coated layer.
I suggest making a jig for them. And it takes me about 30 minutes to do 30 of them.
How large of a batch ate you doing?
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they want 700! I ordered the black ones off amazon so hopefully they work
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I did adjust my settings since this post.
S-700
P- 55
lpi- 195
Vary power
Good luck!
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Please let us know how they work out and what the Amazon link was 
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Worked perfect! thank you
Glad to hear and help!
I’ve wondered how the darker colors would look.
Did the Amazon bottle caps work?
Yes, didnt have a problem with the ones i ordered.
Thank you 