Hello... Producting PCB this way takes even longer time that a coating PCB with photoresist and imaging with laser. And I can confirm that photoresist and laser works very nice with some care down to 4mil track/4mil space without some big problems. I like to see some other methods that use less time .... Slavko.
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Re: [Homebrew_PCBs] A short story of the Selenium Photo-sensitive Drum.
2014-12-16 by Slavko Kocjancic