Well, line up is not a problem. it's the transparent getting deformed when heated.
--- On Fri, 7/4/08, DJ Delorie <dj@...> wrote:
From: DJ Delorie <dj@...>
Subject: Re: [Homebrew_PCBs] double sided PCB, accuracy
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, July 4, 2008, 5:50 AM
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.
[Non-text portions of this message have been removed]