Homebrew PCBs

http://www.dupont.com/pcm/riston/laserseries/fundamentals.html
http://www.anvik.com/results.html

Steve Greenfield wrote:
> 
> Yep, far too long to expose, and the problem of "blooming". UV
> laser, anyone?
> 
> That sounds do-able! It would just require modifying a pen with one
> of those carbide point marking pens. I think you could probably
> just spray something like one coat of black fast drying laquer to
> scratch through.
> 
> And one of the things I've always liked doing to boards I make is
> sign them. Couldn't do that when I made some with the vinyl cutter.
> 
> So the only issues are paint that will scratch away cleanly and
> that it leaves a wide enough opening after etching.
> 
> Steve Greenfield
> 
> --- crankorgan <john@...> wrote:
> > Hi,
> >    Nobody liked my light on a plotter idea. I was told the
> > light source would have to move too slow. The board would take
> > way to long. Ok, I use Mechanical Etching bits myself. But what
> > if you coated the whole board with resist. Then you put a sharp
> > point in the plotter. Have the plotter do isolation paths. Then
> > the board goes to the acid.

You could have a fibre-optic cable close to the pcb resist putting
out high power. Could also try lens focusing with enough power to
speed the exposure.