Instead of making flash cards to learn all the correspondences for the Cantrefs, I decided to make a study cube. Below my instructions are files that can be downloaded, if you would like to make your own cube.
Print out the Cube Net of the Cantrefs document. (It is available as Word and PDF, so if you want to customize yours before printing, you can.) I colored my Cube with colored pencil.
I pre-folded all the areas that would need to be folded to form the Cube. Once the edges are folded, you can start to fold the cube into shape. I used tape on the inside to hold the sides together.
Once all the sides were positioned properly, I taped along the outside seam.
If you’d like to make your own Cube of Cantrefs, templates are below. (The translations of the Cantrefs are from RocasCearcall.)