Here’s a step-by-step guide for printing etch resist directly to
copper clad boards. Two methods of making printed circuit boards
at home have long dominated as the favorites; using photo-
resist, and the toner-transfer method. The latter involves
printing board artwork on a laser printer and then ironing it
onto the copper clad. We’ve seen some efforts to print toner
directly to the copper, or to use ink to adhere toner and then
heat fuse it, but this hack is the first one we remember seeing
that uses an inkjet printer directly. The best reason inkjet
printing isn’t often used is do to the ink’s iability to protect
copper from the etchant. This method uses MISPRO ink that is
pigment based and will resist the acid. An Epson Stylus Photo
R260 printer was chosen because you can get refillable printer
cartridges which work with the ink, and they’re fairly easy to
modify. In order to feed substrate through the device it needs
some physical alteration to make room for the thickness of the
material, and an ATtiny13