[Paul de Groot] wrote in to let us know about a drop-in controller replacement he designed for those economical K40 laser engravers that are everywhere on eBay. With the replacement controller, ...
As any stingy electronics tinkerer can tell you, eBay is a great place for getting components in bulk and on the cheap. They may not be high quality, and they may not be 100 percent reliable, but for ...
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