Homebrew PCBs

Markus Zingg <homebrew-pcb@...> writes:
> I intend to use dryfilm laminate on both sides. The idea is to etch
> from both sides which I think might help keeping the undercuts at
> about half your rate. Just guessing though, and again, I definately
> will try this soon.

I thought of that.  In my case, I couldn't align the toner sheets
accurately enough for that to work with the hole sizes I needed (0.5mm
pitch TQFP).  I'm guessing with photoresist that's not a problem.

Working from one side also gives you a nice trapezoidal hole shape,
which helps release the paste.  Big side down, of course ;-)