Homebrew PCBs

"pr0pert" <propert@...> writes:
> OK I've ordered some Silkjet media and I'm ready to try this, but I
> may have gotten ahead of myself. It seems all the PCB editors output
> positive prints. How are you getting a negative print to be able to
> use a negative process resist? Is there a way of doing this with a
> gerber file? Hidden options for printing? turning the printer upside
> down ;)?

Search the archives for answers.  Mine is to use a custom print driver
that knows how to do inverse and mirror images, as well as put down
more ink than usual.  I put the sources to my driver at
http://www.delorie.com/pcb/pbm2escp2.zip but it will only be useful if
you have a 2880 DPI Epson (or ESC2 compatible) printer, and a way of
generating PBM files and printing raw data.  I.e. "works best on
Linux" ;-)

And not all PCB editors output positives; gEDA's PCB has options
specificially for toner transfer and ink negatives :-)

Another option is to print to a graphic file with an appropriate
resolution (to match your printer), and invert/mirror it in a graphics
editing program.