Metal Engraving

I use the Ortur GRBL 7W Laser, yesterday I was able to engrave my old broken iphone, but today nothing is really happening, can someone help me out? :slight_smile:

when you say today that nothing is happening, what do you mean? its no longer engraving the metal or the laser isn’t firing at all? What part of the iphone are you actually engraving on? thru the glass?

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