Ordinarily, if you want to change the shape in which an object is 3D-printed, you have to alter the computer model that tells the printer what to do. A new and simpler technique, however, allows the ...
It is a moving epicyclic gear train, printed in one go – so gaps have to be fairly accurate. It stays together – and would have to be broken to get it apart – because the gears are all double-helical ...
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