Homebrew PCBs

Stefan Trethan wrote:
> I have actually read the "spam", and found it quite interesting.
> It says they can use cheap (phenolic) board, so hole quality seems not a  
> big issue.

Moreover they are punching rather than drilling
the holes which does seem inexpensive if a bit
crude.  IIRC the polishing action of the bit in
a drilling operation leaves the hole wall relatively
smooth.  Likely the ink is more tolerant of the
punch/shearing operation leaving a more irregular
wall surface.

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