First of all, I think it's a great idea to use these gears to practice basic arithmetic in a fun way. Thank you very much to @Ckobar.
Especially when I want to print in multiple colors, I would like to have several STL files so that I can assign the objects to the colors. This was the original reason why I made a remix. I had also never designed gears in OpenSCAD before, so let's try.

• In my version, there are 2 STL files for each spinner, one for the text and one for the fidget.
• the numbers are rotated so that they are always the right way up when they are selected
• The gears have a cone at the top and bottom so that you can't get your fingers caught in the teeth.
• now I've uploaded a German version for multiplication, using \u22C5 and :, printing profile will follow