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Prusa i3 MK3 Filament Sensor Replacement

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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.

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  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.

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  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.

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  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.

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  6. 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.)

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  7. 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.)

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  8. 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.

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  9. 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.

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

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Bryce Rogers

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