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the tape head writing demo is based on http://hyperphysics.phy-astr.gsu.edu/hbase/Audio/tape2.html
the coil was fun to make. i used the toroidal helical coil parameterization from https://demonstrations.wolfram.com/ToroidalHelicalCoils/ to generate a path to extrude along using https://www.npmjs.com/package/extrude-by-path with 4 points per turn
this is beautiful