I've been making these for a few weeks now and every time I make one They seem to get square'er and truer to an actual companion cube
I wanted to upload this image to document my progression.
They are made from polymer clay by me. I do not use molds so they are individually crafted. There is also a protective glaze over the cube.
I use a sturdy grey card stock to house the pins for shipping. This one went to Canada
I use standard metal bobby pins that have square bezels. It makes the process a little faster, but they do take time.