Cardboard Switch Blade Template Printable – All you need is some cardboard, maker tape, a few brass. Knife switches are not used for most modern day circuits as they have been replaced by switches that are safer at high voltages, but since we’ll. Click on images to download pdf. Learn how to make a realistic switchblade prop using. Get creative with our free cardboard switch blade template printable! (there's a pdf with an illustrated guide if the photos in this guide aren't 100% clear.) Print the template found on the last page of the pdf. We've created a simple template that will allow you to create your own knife switch using cardboard, some conductive tape, and a few brass fasteners. My knives based on these templates might end up being slightly different from the original draw! Create a knife switch with this template and conductive maker tape.