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  1. Make sure the filament is unloaded from the hotend and the printer is unplugged! Don't turn the printer off until it cools down, or you might experience filament jams in the future! Prepare tools included in the MK2S kit or get similar from the nearest hardware shop. Recommended hex sizes are: 2.5 mm, 2.0 mm and 1.5 (1.0) mm
    • Make sure the filament is unloaded from the hotend and the printer is unplugged! Don't turn the printer off until it cools down, or you might experience filament jams in the future!

    • Prepare tools included in the MK2S kit or get similar from the nearest hardware shop.

    • Recommended hex sizes are: 2.5 mm, 2.0 mm and 1.5 (1.0) mm

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

  2. Ensure again the printer is not connected to the power outlet, otherwise, there is a risk of damage to the electronics! Turn left part of the printer with the RAMBo cover towards you. Release the M3x40 screw using a 2.5mm Allen key. Using pliers, cut the zip tie holding the cables from heatbed. Proceed carefully, you can break the cables.
    • Ensure again the printer is not connected to the power outlet, otherwise, there is a risk of damage to the electronics!

    • Turn left part of the printer with the RAMBo cover towards you. Release the M3x40 screw using a 2.5mm Allen key.

    • Using pliers, cut the zip tie holding the cables from heatbed. Proceed carefully, you can break the cables.

    • Unwrap at least two turns of the spiral wrap and follow the cables inside RAMBo cover, locate the connectors and unplug them. Unplug the connectors, DO NOT PULL the cables!

    • Note there is a safety pin on the heatbed thermistor connector, you need to press it before you can unplug the cable.

    • Remove all cables, spiral wrap and the nylon filament from the RAMBo cover.

  3. Lay the printer on the PSU side and move the heatbed almost all the way to the back for better stability. Locate the Y-belt-holder and release slightly both screws using a 2.5mm Allen key. Leave the holder in the Y-carriage together with the screws and if needed you can secure them temporarily with M3n nuts. Using a 2mm Allen key, release all 4 screws (marked red). When releasing the last screw hold the heatbed, otherwise, it will fall off!
    • Lay the printer on the PSU side and move the heatbed almost all the way to the back for better stability.

    • Locate the Y-belt-holder and release slightly both screws using a 2.5mm Allen key. Leave the holder in the Y-carriage together with the screws and if needed you can secure them temporarily with M3n nuts.

    • Using a 2mm Allen key, release all 4 screws (marked red). When releasing the last screw hold the heatbed, otherwise, it will fall off!

    • The heatbed will be no longer needed, store it somewhere safe. You can leave the spiral wrap on for better cable protection.

    • Get your box for spare parts, you will reuse several components from now on.

  4. Turn the printer back on its "feet". Using pliers, cut the zip tie holding the cables from the Extruder. Proceed carefully, you can break the cables.
    • Turn the printer back on its "feet".

    • Using pliers, cut the zip tie holding the cables from the Extruder. Proceed carefully, you can break the cables.

    • Using pliers, cut the zip ties on the spiral wrap behind Extruder. Again proceed carefully, you can break the cables. Unwrap the spiral wrap all the way to the RAMBo cover.

    • Proceed to the next step, where will unplug the Extruder cables.

  5. Follow the cables inside RAMBo cover, locate the connectors and unplug all of them (extruder only). Unplug the connector, DO NOT PULL the cable! Now, carefully remove all cables, spiral wrap and the filament away from the RAMBo case.
    • Follow the cables inside RAMBo cover, locate the connectors and unplug all of them (extruder only). Unplug the connector, DO NOT PULL the cable!

    • Now, carefully remove all cables, spiral wrap and the filament away from the RAMBo case.

    • Some connectors have a safety pin, make sure to press it first before you try to unplug the cable.

  6. Using pliers, cut the zip tie holding cables. Remove the zip tie and move the cables to both sides.
    • Using pliers, cut the zip tie holding cables.

    • Remove the zip tie and move the cables to both sides.

    • Using a 2.5mm Allen key, release all three screws holding the Extruder body. While releasing the last screw hold the Extruder, it will fall off!

    • Remove the Extruder from the printer and place it aside for now.

  7. The X-carriage will be replaced by a new one including the NYLON filament and M3x40 screw, so you can remove it completely. First, remove the belt. Keep it for later.
    • The X-carriage will be replaced by a new one including the NYLON filament and M3x40 screw, so you can remove it completely.

    • First, remove the belt. Keep it for later.

    • Cut zip ties and remove the X-carriage from the smooth rods.

    • Keep the bearings on the rods, no further disassembly of the X-axis is needed.

  8. Using a 2.5mm Allen key, release all three indicated screws on the Front print fan and fan nozzle. Don't try to remove the fan completely yet, you will need to release P.I.N.D.A. probe first. Using a 2.5mm Allen key release the 4 screws on the Left hotend fan. You can remove this fan completely. It will be replaced by a new one. Using a 2.5mm Allen key release the P.I.N.D.A. probe. Push it or screw it upwards and remove it completely. It will be replaced by a new one.
    • Using a 2.5mm Allen key, release all three indicated screws on the Front print fan and fan nozzle. Don't try to remove the fan completely yet, you will need to release P.I.N.D.A. probe first.

    • Using a 2.5mm Allen key release the 4 screws on the Left hotend fan. You can remove this fan completely. It will be replaced by a new one.

    • Using a 2.5mm Allen key release the P.I.N.D.A. probe. Push it or screw it upwards and remove it completely. It will be replaced by a new one.

    • Now, take away the Front print fan and keep it for the reassembly.

    • Using a 2.5mm Allen key, remove the screws holding the Extruder idler.

    • Using a 2.5mm Allen key, remove screws holding Extruder motor. Keep the motor for later use, but remove the pulley, which will be replaced.

    • All printed parts from the Extruder will be replaced by new ones.

  9. Using a 2.5mm Allen key remove the screws and remove this part of the Extruder. Carefully remove the hotend, do not break the cables! Keep the hotend for later.
    • Using a 2.5mm Allen key remove the screws and remove this part of the Extruder.

    • Carefully remove the hotend, do not break the cables! Keep the hotend for later.

    • Everything disassembled? Let's start building MK2.5! 3. X-axis reassembly

    • All printed parts from the Extruder will be replaced by new ones.

Finish Line

143 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

222 Guides authored

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Prusa Research Member of Prusa Research

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13 Comments

Step 6 shows a Rambo case which is different from the original Prusa i3 MK2. The original Rambo case has both heatbed and extruder cable entry from the side.

Nic Hollinworth - Reply

Hi Nic, there have been several iterations of the RAMBo case for MK2 and MK2S, but the principle remains the same.

Jakub Dolezal -

I would use the English word “remove” where you are using the word “release”. (“release” implies you “loosen” the screw but don’t remove it. I think you mean to say your “remove” the screw)

phil gerskovich - Reply

Hi Phil, thanks for the suggestion. I will go through the text and check it.

Jakub Dolezal -

one very small suggestion, I would recommend the red text: “Make sure the filament is unloaded from the hotend and the printer is unplugged! “ at the beginning of the article be changed to read something like: “unload filament, press “X” reset button below dial, and wait until hot end fan shuts down, then unplug”

otherwise some people may experience jams upon reassembly if any stray plastic becomes melted in the heat-break as a result of unplugging the printer after unloading filament prior to disassembly.

Albert Einstein - Reply

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