A little summary of what I think is going on here and what is needed...

For easy prototyping at home one could possibly use a inkjet with
water-resistant ink to print directly to a bare-copper PCB.  Then etch it in
a little home-made bubble-tank and be off.
If one has designed the whole circuit as single sided and used 0-ohm
resistors (links) instead of via's  there would be no drilling involved.

Further, Roman Black suggests using a paste-syringe and a hot-air gun for
the mounting.

This is beginning to sound rather layback :-)

So, to get this show on the road one needs:
- A inkjet printer with a straight paper path capable of handling 1mm+
"paper" (hehe)
- Some sort of ink that will adhere to bare copper and not dissolve in water
(acid?-)
- A way to stuff the ink into a cartridge for the printer
- Simple bubble tank.

I made a bubble-tank for small 100x120mm boards out of a jam-jar by placing
a plate in the bottom with a perforated hose threaded in a circular pattern.
The plate and hose was fastened to the bottom using silicone.  On the
outside I am going to glue a heating foil and then it'll be done.  Connected
to my little aquarium pump it makes a great little tank!

The biggest problem will be getting a printer with a 100% straight paper
path.  Then getting it to squirt our little cocktail.

I think I need such a printer :-)
I'm going to look for one next time I'm at work.  (We have a tonn of old
printers lying around...)

    Kyrre

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