Package includes: 25 Pack 10 Mil 12 x 12 inch blank stencil sheets, large and wide enough mylar sheet to provide excellent support for your complex design projects. Reliable quality: Milky white ...

He uses a laser cutter to cut Mylar sheets into stencils. [Juan] appears to be using EagleCAD and Express PCB. Both tools are available for free to hobbyists. The first step in the process is to ...