An adjustment of about 210% allows them to work with ones my child already has.
Square stacking blocks
Blocks that can stack in various configurations.
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updated November 30, 2022
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I started to model this puzzle (called Wedgits in the US) last year, but never made time for more than the small diamond one. Yours look to be well done. The rounded edges made for difficult measuring.
@OldCurmudgeon Thanks for the info on the product name. Since I didn't have them in my hand, I just had a picture I took of them in the store and some trial & error to get the angles right so that they fit together properly when stacking them, which is why the model files are so small -- faster printing on the testing stage and easy enough to scale up at print time.