A simulated displacement sensor with a measurement accuracy of less than 10 micrometers and a price of less than $10! The measurement range is between 0.5 mm and 1.0 mm

If you want to know the full details of design, construction, and calibration,You can find them here.

I printed my sensor using PETG, with a layer thickness of 0.2 mm, a nozzle size of 0.4 mm, and a fill rate of 50%. I used a high fill rate to ensure that the outer frame would be as rigid as possible.