And there is the problem of shrinkage due to the heat of the fuser.
Uneven shrinkage seems to be the rule, which is bad because you can't
just scale everything up a percent or so.
Steve Greenfield
--- In
Homebrew_PCBs@yahoogroups.com, adam Seychell
<adam_seychell@y...> wrote:
> I have tried a few "good quality" laser printers and never
> had any success. Its well known that lasers cannot
> sufficiently heat up the mylar plastic film to reliably fuse
> the toner. There are special transparencies available that
> supposedly fix this problem. Professionals use inkjets when
> it comes to making photomask for silk screening, ect.
> If you have had good success with laser printed photomasks,
> then please tell us more.
>
> With the epson inkjet/epson transparencies I can expose
> boards at least five times the normal period and still have
> perfect masking of the image. The only problem with such
> long exposures is excessive light undercut.