> Adam wrote:
>
> <SNIP>
>
> My test showed for 18um foil PCB the
> limited factor is the printer, and
> not the etch process. I have compile a
> quick web page showing the results of
> this mornings experiment, enjoy.
WOW - the dot scattering in the
perpendicular direction is dramatic.
Are there options in the printer driver
to slow down the speed the head traverses
the paper or maybe do 12 passes (1 pass
for each of the 12 multiplex rows) to
limit that? Probably unlikely as
marketing types only care that it is 2400
dpi for printing photos and accurate dot
placement is not needed.
>
> <SNIP>
>
> Even thought my results demonstrated a
> printer limitation, I still think
> etch undercut can be an issue,
> especially for bubble etchers or 70um
> ("2oz") foils.
I am going to print out your test circles
on my laser here and take some photos of
it when I get home.
I dont think I will bother exposing or
etchign it as I am pretty certain no
matter how good a resist mask I had my
bubble etcher would limit me to 8/8
across a large board.