Random Calculate Equation Generator

Hello fellow 3D Print fans.

Teaching my kids to calculate, we use to sit an "build" the random equations on paper, using a 10-sided dice.

Instead i have now designed a "Random Calculate Equation Generator"
You just chose how long you want the equation to be and what it must/can contain, and then spin the wheels.

There is a "0123456789" wheel, just print as many you need of the same wheel.
There are also some +,-,X, DIV wheels.
And also a "." wheel if you want to get in to the trouble of "decimal places".

It is made to be printed in one go at my two color Ultimaker printer.
But i also made two "empty wheels", if you want to print the wheels in only one color,
and then write on them using a maker pen or put on stickers.

You can also print "only the number/sign wheels" in one color and numbers/ signs are embossed, and can be read anyway.

I just printed my wheels in "metal" PLA, but i made the axel and clip in ABS for extra strength.

Wheels are about Ø40mm. But they are easy to scale up or down, if you want.

Dealing with kids i did not like small parts.
So i designed axel and lock clip to be a little more big,
than "what could have done the job".

A nice and little, easy to use tool, where the kid can make his/her own equations to figure out.