A TechShop Membership (Not required but highly recommended)
Whatever is in the desired scrap bin (Or something you purchased)
Purel - 70% alcohol hand sanitizer
Apollo Inkjet Transparency Film (It cannot be multipurpose or quick-dry. And I don't know about other brands)
An inkjet printer - The higher quality the better
A Brush for the hand sanitizer
Step 1: Surface Grinding
Through doing roughly 8 of these pieces, there are many variables that can affect the final outcome. The most effective method to prepare the surface is to use an angle grinder and a Flap Disc. This creates grooves in the metal that makes it easier for the ink to stay on the material. When I was taught how to do this, the hand sanitizer method was mainly used for porous materials but I got a cool imperfect look with metal.
As I have stated in my previous instructables, when using rotary tools it is important to not where gloves and keep otherwise loose things away. At the same time, it is important as always to wear safety glasses.
Clamp down the piece of metal you choose, and grind it down! Be sure to be cautious of heat build up, especially with thinner gauge material. It is definitely possible to not only burn the metal but also grind through it. You want to make sure that the metal is ground down enough to create consistent scoring as well as brighten the surface to bring out the highlights. In the image provided you can easily see the before and after of this piece of scrap metal that I found.