It is a remix from the model on Printables by user Jobla
https://www.printables.com/model/27323-domino-tiles-puzzle-multiplication-tables
The original puzzle is made for multiplication.
There is a scad file provided by the designer for modification so I remixed it into addition from 0 to 10 for my 4 years old.
I also designed a peg broad and storage box to help my 4 years old to learn about addition. I will upload it later
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