hello,
I'm making filament extruder to change my old 3 mm filaments rolls to 1.75 mm ones...
for that project I want to measure the diameter of filament (must be 1.75mm) ...
any idea to make such measurement device ?
I'll been looking for mechanical device with hall sensor and magnet ...
... but I don't think they works good enough ...
.... maybe led and ldr resistor ... maybe linear sensor array (400 dots per inch or so)...
but optical linear sensor are very hard to find from sellers and they are rather expensive !
have anybody made that kind of sensor ?
I'll be happy if someone can advice me to do that kind of measurement device 
friendly regards from Finland northern EU
-artsi-
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I have made a filament width measuring instrument using TSL1401CL (this is an inexpensive optical linear sensor array).
I think there was also a commercial product.
Something like this:
Since In my project, I attached a lens to improve the resolution, it took some time to adjust the optical device, but finally got the resolution was about 0.02 mm.
EDIT:
If you are interested, you can also buy the TSL1401R sensor itself at a low price.
Since it is a DIP package, it can also be used on a breadboard.
It can be used at 5V and can be easily interfaced with Arduino.
If you don't use optics, just pinch it between two rollers and measure the spacing.
It provides a more reliable measurement.
You can hack measurements from many cheap Chinese digital calipers.
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