Toy weigher (SET 1 : ONLY WEIGHER PARTS)

Printable toy weigher - learning children numbers,arithmetic and concepts more, less, equal. 
Each digit has a weight equal to the number - 1 - 1 g, 2-2 g, and so on. How heavy the star you have to know yourself. We can solve simple arithmetical: 2 + 1 = 3, 3 + 4 = 7, 1+2<5 etc.

It contains two sets for 3D printer (STL format):
1.  Details of the weighter (this model)
2. Numbers and star. (see https://www.shapeways.com/product/XZQ2GWLHR/toy-weigher-set2-digits-only  )