Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] double sided PCB
From: DJ Delorie <dj@...>
Date: 2008-07-04
What I've been doing is including a "target" in my prints (four 25 mil
squares in a square, with a 1 mil gap - that translates to a 1 mil ink
crosshair when I print negatives). I print this on all photomasks and
one on plain paper. The plain paper one I use to pre-drill 16 mil
holes at each crosshair. Then, when exposing, I can line up the holes
with the crosshairs pretty accurately, and double-check through the
glass overlay.