Kids love to play the toy grocer's shop. Then they need a toy scale. It's a great game and a wonderful opportunity to gain experience in simple physics.
This scale is precise to a few grams other then the typical toys you get on the market. The pivot points are equipped with small ball bearing (ZZ685 5x11x5) and the arm constructed like a parallelogram keeps the 'bowls' straight.
My build was done on a desktop cnc-machine by Stepcraft from 6.5 mm beech plywood using a spiral-toothed 1.2 mm flute.
Visit https://www.zenziwerken.de/en/ for more interesting designs.
Tomo Kihara created a derivate of this scale for using as a tool on 'Street Debater', an alternative to begging. Read more about his project here.
I started out with a rough sketch ...
refined the drawing using Solid Edge 2D ...
and build a 3D model for verification of the plan.
A final render helped to get a really good feeling of the proportions