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Macetech shares details on removing PCB resist with a laser cutter -

It’s easy to remove most of the residue using water and a paper towel. I used to use alcohol because it removed the residue almost instantly, but I found that it also eroded the paint mask too much. Water alone doesn’t get enough of the residue off, so you need a very mild abrasive polish. The best I’ve found for the purpose is ordinary toothpaste, although I forgot to bring it to Techshop and used some plastic polish instead. This also works fine, but it has a wax which needs to be removed with a grease-cutting soap before you attempt to etch the copper.

His test board was a revised version of the Stealth USB Capslocker project. Read on for his specific settings for the Epilog and more process pics at his blog.

More:

HOW TO – Use a laser to etch PCBs (printed circuit boards)

Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!


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