Addition/Subtraction Slide Rule Toy (up to 10)

The number selected in the ‘window’ is the sum of each one of the stacks on the ruler.

I printed it twice, once in each color, then swapped the number cover plates for the multi-color.  The numbers are extruded so if you prefer you could print one and use sharpie to highlight the numbers.  Or color the numbers and upload your own print profile :)  But I didn't do it that way because the print orientation would cause a lot of filament changes.

At the current size, the inside of the numbers are really small and hard to glue into the inside of the numbers.  I'm considering doing another scaled bigger, but we will see if I get time.  Race me to it?  lol.