Alex365
The right most exposure time was 13 minutes. It still seems to be underexposed. The letters on the left have sharp edges, so the distance of the leds to the board seems to be sufficient. I'm currently using H2O2 + HCl for etching.
First exposure:
A project log for UV Exposure Unit
UV Exposure Unit reproducable in every Hackerspace with a Laser-Cutter.
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