Homebrew PCBs

Henry Liu <henryjliu@...> writes:
> If you have an Epson Printer, you can just print it out and cure it.

I have an R280 but it's not converted for PCB use.  I use it to print
photofilms and do glossy photos.

> That way and placement accuracy is much better.

How?  How can the printer know where the copper is, so it can print in
the right spots?  With film I can visually align the film to the board
before exposure.