The Original Prusa i3 MK3 is the successor of the award-winning Original Prusa i3 MK2 3D printer.

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Problem with the filament sensor

During the self test. I keep getting a filament sensor wiring error. I have chk both connections and they are connected correctly. I have used a multimeter on all the wires and power is flowing from one connection to the next on all wires. What could the problem be?

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Hi David,

the filament sensor can be faulty, please contact our support using live chat or email (info@prusa3d.com)

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How do I access the live chat ?

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Hi David,

please see the Step 7 : 1. Introduction

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I have the same problem. But my sensor worked during pre-flight and now it does not. I ohmed the cable.

Found the GitHub section with the schematics. The Red and Black wire +5VDC which Black wire being ground

The Blue and white wire have 4.7K ohm resistors to +5V

Test procedure.

1) cable connected to controller Red=5V, Blk=gnd,

2) cable connected to sensor Red resistance check: to Blue wire=4.7K ohm, to White wire = 4.7Kohm

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My sensor has been misswired and the self test failed. After that I corrected the sensor wiring but the self test does not succeed. I measured the cables as you did and the resistance and voltages are correct. I wonder if I managed to fry the chip on the sensor.

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Hi, in case the sensor doesn't work, recheck the connections are according to the manual (guide) and if so, please contact our support info@prusa3d.com

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I'm having the same problem; have rechecked all wiring, tested the cable, and inspected the sensor for visible damage or debris. No response from info@prusa3d.com (sent 12 Apr). Please help.

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Hi Christopher, I will alert colleagues to get in touch with you.

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It depends what your wiring error your found was.

If the red and black wires were reversed (+5V and Gnd). Then yes the chips are damaged with the current board rev 0.1

If the board has a fuse on it F1 then the fuse is blown and I would get another sensor. Put you could bypass the fuse and try again. Note this is a very new board it might not be out

If the other colors are swapped then you are ok.

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David gallegos will be eternally grateful.
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