When the job at hand is measuring something with micron-range precision, thoughts generally turn to a tool with a Mitutoyo or Starrett nameplate. But with a clever design and a little electronics know-how, it turns out you can 3D print a displacement sensor for measuring in the micron range for only about $10.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/05/18/flexures-keep-this-printed-displacement-sensor-in-line/