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Goto well to know more.
Are you using mm/m?
The advertisement says metal but it only shows them cut 0.05mm Stainless.
@berainlb has a good point about visible light lasers not working too well with metals.
With copper, you may not be able to do much.
I don’t use my led types for this, but I have a fiber and engraving copper has a lot of issues that effect how it’s engraved
Copper has a higher melting point, according to the Internet on lasing metals. It also is one the of the most heat conductive metals we have… makes it great for cooking… but not so great for lasers.
On the fiber I have to make big changes to get much of an effect…
Dropping the speed is about all you can do if you’re at 100% power.
I’d drop a note to the vendor and ask them.
If you are looking for more details, kindly visit melt extracted stainless steel fiber.