Articulated sliding doors
thingiverse
This pair of train-like sliding doors is operated using a single lever. For door enthusiasts ;) https://www.youtube.com/watch?v=ThBWmhU9lu4 Print parts flat on the surface and assemble like in the picture. No special postprocessing required. The same principle extended to 3 dimensions is used in my Train with the sliding doors model: https://www.thingiverse.com/thing:3568368
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