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

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

How to replace a print fan (MK4 / MK3.9)
Relevant for:
Last updated 4 months ago
How to replace a print fan (MK4 / MK3.9)
 Difficulty
Moderate
 Steps
9
 Available languages
CSPLDEESITFRJA
Introduction
Introduction
Introduction
This guide will take you through the Print 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.
Loveboard cover removal
Loveboard cover removal
Loveboard cover removal
Remove the loveboard cover on the extruder by lifting it up.
Disconnect the print fan from the Loveboard.
Note there is a small safety latch on the connector, which must be pushed in, while you pull the connector out, in order to disconnect it.
Fan removal
Fan removal
Fan removal
Using the 2.5mm Allen key, remove the two M3x6 screws holding the print fan.
Remove the print fan.
Print fan cable management
Print fan cable management
Print fan cable management
Take the replacement print fan and guide its cable through the opening in the print fan holder.
Tuck the cable into the dedicated channel in the print fan holder. The cable must not protrude out of the channel, otherwise, it won’t be able to insert the fan later on.
Print fan installation
Print fan installation
Print fan installation
Print fan installation

Cover the cable with the print fan, as seen in the picture.

First, insert the bottom of the fan into the fan shroud (printed part below the fan). Then, press the fan towards the print fan holder behind it.

Do not pinch the cable!
Make sure there is no gap between the print fan and the print fan holder behind it - meaning, the cable fits properly into the dedicated channel.
Make sure the fan has been inserted properly into the fan shroud.
Finishing the fan installation
Finishing the fan installation
Finishing the fan installation
Finishing the fan installation
Fix the fan in place using two M3x6 screws.
Connect the fan cable into the corresponding connector on the Loveboard.
Cover the extruder with the Loveboard cover on top. Make sure none of the cables gets pinched.
Done
Done
Done
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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