In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Dave;

Years ago I did something similar to your suggestion.

I modified the "pen" on one of those flatbeds to be a moving fiber optic thread.. fishing line actually.. and had an LED driving the fixed end. The LED was turned on/off by the "penup/pendown" commands. It traced the plotted lines beautifully at moderate speeds, and exposed the sensitized board properly.

It was quite slow as whole areas needed to be filled with just a small aperture, but the concept worked. I suppose that a stronger light like a laser would be MUCH faster.

Anyhow, I went back to silk screening the boards, but continued to be on the lookout for other direct CAD to Etch concepts. I believe the wax printer is a suitable candidate, but if proper liquid inks could be found then all sorts of other ideas become valid.

Hopefully John's enquiry to the ink supplier meets with some success.

Cheers,

Peter (pjv)

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