Step 2: Print on pnp blue
1.- Create your design in any vector app: Illustrator, Corel Draw, Ink Scape, etc.
2.- Flip the design before printing as you would with pcb etching.
3.- Print the design on regular paper sheet(100% scale), this will work as a guide to print on the pnp sheet.
5.- Cut a piece of pnp-blue just big enough to extend a little bit from the edges of your design on the already printed paper sheet, the extra length will help to print and transfer the design to the aluminum panel.
6.- stick the pnp blue to the printed paper sheet with some tape on each corner, use just enough tape to hold the pnp in place.
7.- Set the laser printer to high quality print, again, 100% scale.
8.- Print again, you should end with something like in the image below.