Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

If you want to use a press, you need something heat resistant (but still
heat conductive) yet flexible, to put between the paper and the hot
plate, so that every bit of toner gets equal pressure. You still have
to make sure the toner gets hot enough to be plastic, but not hot enough
to be liquid. Bonus points if you can keep pressure on the paper until
after it cools a bit.