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How to replace a hotend fan (MK4 / MK3.9)

How to replace a hotend fan (MK4 / MK3.9)

How to replace a hotend fan (MK4 / MK3.9)
Relevant for:
Last updated 5 days ago
How to replace a hotend fan (MK4 / MK3.9)
 Difficulty
Easy
 Steps
9
 Available languages
CSPLDEESITFRJA
Introduction
Introduction
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.
Preparation
Preparation
Preparation
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.
Disconnecting the cables
Disconnecting the cables
Disconnecting the cables
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.
Removing the cables
Removing the cables
Removing the cables
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.
Attaching the hotend fan
Attaching the hotend fan
Attaching the hotend 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.
Connecting the cables
Connecting the cables
Connecting the cables
Connecting the cables
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.
Finishing the fan installation
Finishing the fan installation
Finishing the fan installation
Finishing the fan installation
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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