crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0

Prusa i3 MK3 Filament Sensor Replacement

crwdns2915892:0crwdne2915892:0

If you need to replace the filament sensor in your PRUSA i3 MK3, follow the steps in this guide. Ensure that you do not lose any of the parts or socket-head screws that are removed during replacement.

crwdns2942213:0crwdne2942213:0

  1. Prusa i3 MK3 Filament Sensor Replacement, Filament Sensor: crwdns2935265:01crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement, Filament Sensor: crwdns2935265:01crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement, Filament Sensor: crwdns2935265:01crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Orient the printer so that the screen is facing to the left.

    • Using the On/Off button, switch the printer into the Off position.

    • Ensure your printer is off by visually inspecting the screen. If the screen is not lit up, your printer is off.

    • Ensure the printer has cooled to room temperature before beginning disassembly.

    crwdns2913378:0crwdne2913378:0

  2. Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:02crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:02crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Orient the printer so that the top of the extruder head can be accessed.

    • Remove the two 2.5mm X 10mm socket head screws. These screws secure the cover of the filament sensor.

    • Remove the filament sensor cover.

    crwdns2913378:0crwdne2913378:0

  3. Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:03crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:03crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Orient the printer so that the screen is facing to the right.

    • Loosen the two 2.5mm X 40mm socket head screws while holding the extruder head firmly, keeping pressure on the opposite side.

    • Ensure the screws have cleared the embedded square nuts on the back side.

    • Be careful not to lose the small springs that are held in place by the screws.

    crwdns2913378:0crwdne2913378:0

  5. Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:04crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Orient the printer so that the screen is facing to the left.

    • Remove the 3D-printed cover piece on top of the extruder access door. (Your printer might be missing this part.)

    crwdns2913378:0crwdne2913378:0

  6. Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:05crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:05crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:05crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Orient the printer so that the screen is facing away from you.

    • Remove the 2.5mm X 30mm socket head screw located on the top left of the backside of the extruder head.

    • Rotate the printer so that the screen is facing to the left.

    • Remove the extruder access door from the extruder head.

    • Be careful not to lose the square nuts that hold the screws removed in Step 3. (They sit inside the extruder access door.)

    crwdns2913378:0crwdne2913378:0

  7. Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:06crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:06crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:06crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Orient the printer so that the screen is facing to the left.

    • Remove the 2.5mm X 10mm socket head screw located behind the extruder access door that was removed in Step 5.

    crwdns2913378:0crwdne2913378:0

  8. Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:07crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:07crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Prusa i3 MK3 Filament Sensor Replacement: crwdns2935265:07crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Orient the printer so that the top of the extruder head can be accessed.

    • Locate the filament sensor.

    • Hold the filament sensor in place while unplugging the wiring connection.

    • Use caution because the wiring connections may be fragile.

    • Remove the filament sensor.

    crwdns2913378:0crwdne2913378:0
crwdns2915888:0crwdne2915888:0

To reassemble your device, follow these instructions in reverse order. During reassembly, ensure not to tighten the socket head screws too tight.

crwdns2862417:0crwdne2862417:0

crwdns2935293:0crwdnd2935293:04crwdnd2935293:0crwdne2935293:0

Bryce Rogers

crwdns2935283:001/23/24crwdne2935283:0

160 crwdns2915208:0crwdne2915208:0

crwdns2935295:0crwdne2935295:0

crwdns2918514:0crwdne2918514:0: 5

crwdns2935301:02crwdne2935301:0

crwdns2935287:0crwdne2935287:0

Western Carolina University, Team 1-5, Virtue Spring 2024 crwdns2935289:0Western Carolina University, Team 1-5, Virtue Spring 2024crwdne2935289:0

WCU-VIRTUE-S24S1G5

crwdns2931471:04crwdne2931471:0

crwdns2935297:06crwdne2935297:0

crwdns2947412:00crwdne2947412:0

crwdns2917038:0crwdne2917038:0

crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 0

crwdns2936753:07crwdne2936753:0 10

crwdns2936753:030crwdne2936753:0 47

crwdns2942667:0crwdne2942667:0 651