Homebrew PCBs

fana cute <fan_nastelroy@...> writes:
> oke thanks djdelorie, it works at 12 mils track, may i ask question
> again, have you tried with 8 or 6 mils with same methode? how the
> result?

With the pulsar paper and green film (which protects against pinholes
and other toner-related problems), I've managed 6.7 mil traces (four
pixels wide on my printer) with some success (like 50%, so I always
put two or more of each board on the panel, to get one good one).  8.3
usually works OK but still with some risk of errors.  You have to keep
in mind the size of your laser pixels - mine are 1.33 mils across, so
I use multiples of that to ensure that all my traces and spaces are
consistent (if you choose 6 mil, some are 6.7 and others are 5).

With the inkjet and photomask, it looks like 6 will be reliable as
long as I'm careful about mask defects (dust, bubbles) and the etching
process (i.e. 6 mil traces are easy, 6 mil space might be an issue,
5/7 might be more reliable than 6/6).