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I've build and flashed my board.....but when I try to calibrate using 1/16 drill rod (1.57), I always got 1.38V instead of 1.57v. I alread checked LED position (to make sure it's straight), connections, supply (tried with stabilized 5v power, and now it's testing on RAMPS), always same result. I have included two PTFE tubes on in and out of fillament to make sure that's really straight and not bended.....always same result: 1.38v on calibration. What am I doing wrong?