Duplo to K'Nex (uck-00f03m)
thingiverse
The Free Universal Construction Kit, a project by F.A.T. Lab and Sy-Lab in collaboration with Adapterz LLC, offers adapter bricks to ensure interoperability among various popular children's construction toys like Lego, Duplo, K'Nex, etc. It encourages cross-system play by allowing any piece to join any other. The Kit is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported license and comes with a warning for children under three years old. More details can be found at http://fffff.at/free-universal-construction-kit. Note that it's not affiliated with the individual toy brands.
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