The Answer.

Also, just having fun trying out a some 3D CAD and printing ideas. More versions on the way.

This one is called "Exploding Cube."

OnShape 3D CAD files :

https://cad.onshape.com/documents/af42b438f2b265a9a379e2f6/w/22a256a79fa182a723de31ae/e/cf6c89606b1a813e230abf0e

Print instructions

Print in PLA using the provided 3mf files.

The numbers print in two colors with filament switching.

Six copies of the numbers are needed - I printed them 3 at a time, but you could probably print all six at once.

I recommend printing the "center cube" in the same color as the peg-end of the numbers to make it "invisible".

Insert the pegs on the numbers into the "cube" - they are a tight fit and the numbers will break if you are not careful (ask me how I know!).