How to make a companion cube

Make one with paper or cardstock

heypapaya on discord shared a printable template that you print, cut and fold a cube with. An archive copy of the template is here as well.

3D Print your own cube

Anki Vector Dummy Cube Box by Dauler. This also includes a PDF with the symbols for the cube sides

You can buy STL files from etsy.

Emulate the cubes electronics

[Efforts to create a "clone" of the cubes electronics.] (https://forums.anki.com/t/communicating-with-vectors-cube/43042)  SparkFun Pro nRF52840 Mini bluetooth development