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  1. Ensure the printer is turned off and not plugged in!!! Also check the filament is unloaded from the Extruder! Prepare tools included in the MK2S kit or get similar set from the nearest hardware store. In the Multi Material kit you will receive a wrench and Allen keys.
    • Ensure the printer is turned off and not plugged in!!! Also check the filament is unloaded from the Extruder!

    • Prepare tools included in the MK2S kit or get similar set from the nearest hardware store. In the Multi Material kit you will receive a wrench and Allen keys.

    • Prepare the Multi Material upgrade kit received from Prusa Research.

    • We strongly recommend getting a box or a bowl for nuts and screws. You will need some of them later during the assembly.

  2. Rotate the back of the printer towards you. Using pliers, cut and remove the zip ties holding the spiral wrap as shown in the picture.
    • Rotate the back of the printer towards you.

    • Using pliers, cut and remove the zip ties holding the spiral wrap as shown in the picture.

    • You can leave zip ties holding "black" cable holders.

  3. Unwrap the spiral wrap all the way to the  Rambo cover. Using pliers, gently twist the zip tie until it breaks, then remove it. Don't try to remove the spiral wrap yet, it might be wrapped partly inside the cover and you can damage the cables. Wait for the next step!
    • Unwrap the spiral wrap all the way to the Rambo cover.

    • Using pliers, gently twist the zip tie until it breaks, then remove it.

    • Don't try to remove the spiral wrap yet, it might be wrapped partly inside the cover and you can damage the cables. Wait for the next step!

  4. Using 2.5 mm Allen key release the screw holding the RAMBO cover door. Unwrap spiral wrap inside the cover and remove it completely.
    • Using 2.5 mm Allen key release the screw holding the RAMBO cover door.

    • Unwrap spiral wrap inside the cover and remove it completely.

    • Gently take all the cables away from the top opening. Proceed with caution and don't pull, you need to unplug the connectors first.

    • !!! Carefully unplug the connectors of the Extruder. Do not pull the wires, but reach inside the cover and grab the connector (release the safety PIN if needed first) !!!

  5. Locate a zip tie on the back of the extruder. Using pliers, gently twist the zip tie until it breaks. Split the cables in the following order (last picture):
    • Locate a zip tie on the back of the extruder.

    • Using pliers, gently twist the zip tie until it breaks.

    • Split the cables in the following order (last picture):

    • The front fan and the P.I.N.D.A. probe to your left.

    • Nylon leave untouched.

    • Heater cables and the thermistor press slightly below the X-axis (be careful).

    • The left hotend fan and the extruder motor cable go to the right.

    • Ensure the ends of the cables with connectors are separated from each other properly.

  6. Using the 2.5mm Allen key release all three screws. When releasing the last screw, hold the front part of the extruder, it will fall down! Take all three screws away and put them in a box, you will need some of them later.
    • Using the 2.5mm Allen key release all three screws. When releasing the last screw, hold the front part of the extruder, it will fall down!

    • Take all three screws away and put them in a box, you will need some of them later.

    • Leave the rest of the X-carriage untouched (in case of MK2S).

  7. Use 2.5mm Allen key for the entire disassembly. Release 4 screws on the Left hotend fan. Remove the fan together with screws and keep it for reassembly.
    • Use 2.5mm Allen key for the entire disassembly.

    • Release 4 screws on the Left hotend fan.

    • Remove the fan together with screws and keep it for reassembly.

  8. Release the screws on the Fan nozzle and Front print fan, move it to the side. Don't try to remove the fan completely! Release all screws on the P.I.N.D.A. holder and gently slide the sensor upwards.
    • Release the screws on the Fan nozzle and Front print fan, move it to the side. Don't try to remove the fan completely!

    • Release all screws on the P.I.N.D.A. holder and gently slide the sensor upwards.

    • As soon as the P.I.N.D.A. sensor is out, you can also remove the Front print fan. Keep all parts from this step for later.

    • There are threads inside the P.I.N.D.A. holder, if you can't push the sensor out, use screwdriver and slightly open the holder (be careful not to break it!).

  9. Turn the extruder upside down and release two screws holding the Extruder motor. Ensure the motor won't fall off and damage itself, you will need it later.
    • Turn the extruder upside down and release two screws holding the Extruder motor.

    • Ensure the motor won't fall off and damage itself, you will need it later.

    • Release two screws holding the extruder idler.

  10. Remove 2 screws holding the extruder cover, keep the cover including nuts for later. Carefully remove the hotend and store it somewhere safe, for the Multi Material you will get a new one.
    • Remove 2 screws holding the extruder cover, keep the cover including nuts for later.

    • Carefully remove the hotend and store it somewhere safe, for the Multi Material you will get a new one.

    • Extruder disassembly is finished! Let's start building the Multi Material! Proceed to the 3. Multiplexer assembly

Finish Line

70 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

235 Guides authored

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Prusa Research Member of Prusa Research

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377 Guides authored

One Comment

For the record, this step took me about 50 minutes.

Nicholas Vellenga - Reply

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