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For those that want to test that 0.11mm fluctuation. I have connected the sensor to a aduino and wrote a very short sketch.
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
delay(10); // delay in between reads for stability
I collected around a 1000 samples while a piece of filament was placed in the sensor. This is the result:

The black line is a 32period moving average.