Hobby wood. small amount
Wood glue. small amount
TechShop's Laser Cutting and Etching SBU is required.
This was made at TechShop. Check out techshop.com!!
Step 1: Cut out jig
Unless you want to etch a significant amount at a time I would suggest just making a small jig.
Cut out a piece with the holes in it and glue it to a solid piece. This will hold the key chain firmly so its doesn't shift and it will protect the other side.