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Nov 5, 2014 - Modified Nov 6, 2014

Can't wait for a version that takes into account the fact that filament is never exactly round.
Maybe you could use two leds at 90 degree that emit different wavelenghts and use filter with the sensors so they see only one wavelenght each. Dont know much about the subject (or if its even possible) but I'm sure there is someone with the proper knowledge out there that could give us a few hints.