Homebrew PCBs

I've been wondering about this.

There's a compound of Gallium, Indium and Tin that freezes at minus 4  
degrees F.    So it's liquid at room temperature.

You can coat your own mirrors, paint it on stuff, maybe you could use  
it to draw antenna grids on glass.

If you use pure Gallium, it would melt in your hand, but freeze below  
that temperature to a solid.    Even if you could get pure Gallium to  
work in an inkjet you'd need a heater to keep it warm or it would  
freeze up in the ink tank.

William Carr

On Feb 9, 2007, at 3:18 PM, David McNab wrote:

> - finding an affordable, highly conductive ink with particles fine
> enough to pass through the inkjet nozzles, and print without errors,
> and without clogging the nozzles
>
> - finding a good insulating ink that will get enough coverage of  
> enough
> thickness to avoid shorts or other electrically undesirable effects
>
> - converting n-layer PCB artwork files into a set of alternating  
> layers
> of conductive and insulating ink
>
> - ensuring accurate registration of the substrate through n passes
> through the printer - rotational error would need to be pretty much
> zilch, x and y errors would need to be around 4mil or less
>
> Anyone got any thoughts on this?
>
> Cheers
> David



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