⬢This guide will take you through the Hotend fan replacement on your Original Prusa MK4 or MK3.9.
⬢All necessary parts are available in our eshop prusa3d.com.
Note that you have to be logged in to have access to the spare parts section.
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- How to replace a hotend fan (MK4 / MK3.9)
How to replace a hotend fan (MK4 / MK3.9)
Menu
- Printer maintenance
- How to install the Nextruder V6 Nozzle Adapter (MK4/MK3.9)
- How to replace the Prusa Nozzle (MK4/MK3.9)
- How to replace a print fan (MK4 / MK3.9)
- How to replace a hotend heatsink (MK4 / MK3.9)
- How to replace a Heatbed Thermistor (MK4/S, MK3.9/S, MK3.5/S)
- Filament Guide addon (MK4S/MK4)
- How to replace Loveboard (MK4S/MK4/MK3.9S/MK3.9)
- How to replace a hotend heater (MK4/MK3.9)
- How to replace a hotend thermistor (MK4/MK3.9)
- How to replace a hotend fan (MK4 / MK3.9)
- 1. Introduction
- 2. Tools necessary for this chapter
- 3. Preparation
- 4. Disconnecting the cables
- 5. Removing the cables
- 6. Hotend fan parts preparation
- 7. Attaching the hotend fan
- 8. Connecting the cables
- 9. Finishing the fan installation
- How to replace the xBuddy board (MK4/MK3.9/MK3.5)
- How to replace a hotend assembly (MK4 / MK3.9)
- How to replace xLCD (MK4/MK3.9/MK3.5)
- How to replace the silver PSU with the black PSU
How to replace a hotend fan (MK4 / MK3.9)
⬢For this chapter, please prepare:
⬢2.5mm Allen key
⬢Before you start, make sure the extruder on your printer is in the middle of both the X and Z axes.
⬢Power off your printer and disconnect it from the power.
⬢Remove the loveboard cover on the extruder by lifting it up.
⬢Disconnect the print fan, heater thermistor and heater cables.
Note there is a small safety latch on each connector, which must be pushed in, while you pull the connector out, in order to disconnect it.
⬢Open up the print fan.
⬢Remove the hotend thermistor and heater cables from the cable groove in the x-carriage.
⬢Disconnect the hotend fan cable and pull it out of the cable groove.
⬢Remove the two M3x18 screws holding the hotend fan and remove the fan.
⬢Attach the hotend fan to the heatsink using two M3x18 screws.
⬢Make sure the cable is pointing to the left.
⬢Guide the hotend fan cable through the groove in the x-carriage and plug it to the corresponding connector on the lower left part of the Loveboard.
⬢Guide the heater thermistor cable through the channel in the x-carriage and plug it to the corresponding connector on the Loveboard.
⬢Guide the heater cable through the channel in the x-carriage and plug it to the corresponding connector on the Loveboard.
Make sure none of the cables is protruding out of the cable groove in the X-carriage. Otherwise, the print fan won’t close. You can use the Allen key to gently push the cables in.
⬢Close the print fan and plug it to the corresponding connector on the Loveboard.
⬢Cover the extruder with the Loveboard cover on top. Make sure none of the cables gets pinched.
⬢The fan replacement is finished. Verify your extruder is assembled as seen in the picture.
⬢To test out the fan functionality, visit the menu Control > Calibrations & Tests > Fan test.
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