OK, what I'd like to see is a system using laser to heat/melt copper
    powder so that it sticks to a bare fiberglass board.
        :
    Whaddya think ?

I think molten copper doesn't stick to fiberglass. :-) It probably burns
the fiberglass, emitting all sorts of nasty burning epoxy fumes, but I'm
pretty sure it doesn't stick.  Real PCB material is essentially made by
GLUING copper foil to fiberglass.

I think...  Modern low power circuits ought to be implementable using
carbon-based inks for traces and carbon-containing glue instead of solder.
I think someone ought to play with THAT a bit...

BillW

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