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If the sensor is 400dpi, that works out to 15.75 pixels of resolution per mm, or 0.0635mm/pixel. Is there some sort of supersampling that takes place to increase the resolution? Because it seems that 1 pixel of resolution means it is either 3.00mm filament or 3.0635mm or 2.9365mm which would be a pretty giant difference for just one bit which I'd expect is within the domain of error in the sensor.

Testimonials of users indicate the device works, but how can just 1 pixel effectively tuning the extrusion multiplier 2.1% one way or the other be accurate?