The game consists of 10 number pieces from 1 to 10. Each piece has a height in centimeters that corresponds to the respective value.  I saw this toy made out of wood and thought that I could make it better. 

Small magnets are built into the ends of each number: this makes it easy to put the numbers together and they hold together better when playing or stacking. Ideal for small children's hands.

It is possible to print those with a normal mono-material printer, by changing the filament at the correct time.