The Free Universal Construction Kit
So wonderful! It’s an openly-available design for 3D-printing adapters for a bunch of building systems (e.g. Lego, Tinkertoy). The attention to detail is amazing:
“Prior to modeling, the dimensions of the various toy connectors were reverse-engineered with an optical comparator fitted with a digital read-out accurate to less than one ten-thousandth of an inch (0.0001in., or 2.54 microns).”
This is exactly the kind of thing 3D printers should be used for.
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