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How to replace a print fan (MK3S/MK3S+)

How to replace a print fan (MK3S/MK3S+)

How to replace a print fan (MK3S/MK3S+)
Relevant for:
Last updated 7 months ago
How to replace a print fan (MK3S/MK3S+)
 Difficulty
Moderate
 Steps
16
 Available languages
CSDEESFRITJAPL

Step 1 Introduction

Introduction
Introduction
This guide will take you through the replacement of the print fan on the Original Prusa i3 MK3S and MK3S+.
Some parts might slightly differ. However, it does not affect the procedure.
All necessary parts are available in our eshop shop.prusa3d.com
Note that you have to be logged in to have access to the spare parts section.

Step 3 Preparing the printer

Preparing the printer
Preparing the printer
Turn the printer off and unplug it!
Before you proceed, it is recommended to protect the heatbed.
Take off the flexible steel sheet.
Use any cloth or piece of fabric, which is thick enough and cover the heatbed. This will ensure you won't damage (scratch) the surface during the disassembly.

Step 4 Disconnecting the print fan

Disconnecting the print fan
Disconnecting the print fan
Disconnecting the print fan
Open the Einsy case and cut the two zip ties on the cable bundle. Avoid cutting the cables!
Release two screws on the cable clip and remove the clip.
Disconnect the print fan cable from the EINSY board.

Step 5 Removing the x-carriage-back

Removing the x-carriage-back
Removing the x-carriage-back
Removing the x-carriage-back
Removing the x-carriage-back
Cut the zip ties on the cable-holder and remove them.
Remove the textile sleeve from the cable bundle.
Release four screws on the x-carriage-back part.
Push the print fan cable through the opening in the x-carriage-back.

Step 6 Removing the print fan

Removing the print fan
Removing the print fan
Removing the print fan
Remove the P.I.N.D.A./SuperPINDA (black) cable and print fan (yellow-red-black) cable from the channel in the extruder.
Release two screws on the print fan.
Remove the print fan from the extruder.

Step 8 Mounting the new print fan

Mounting the new print fan
Mounting the new print fan
Place the print fan to the extruder.
First, slide the fan in the fan-shroud and make sure it is aligned properly.
Second, fix the fan in place using one M3x20 screw. Tighten carefully, or you will damage the fan's casing.
Place the remaining M3x20 screw and tighten it, but carefully, or you will damage the fan's casing.

Step 9 Guiding cables behind the extruder

Guiding cables behind the extruder
Guiding cables behind the extruder
Guiding cables behind the extruder
Guiding cables behind the extruder
Guide the print fan cable behind the P.I.N.D.A./SuperPINDA sensor back to the cable bundle.
Place the cables on the P.I.N.D.A./SuperPINDA sensor side and over the lower smooth rod, then push them back in the channel.
Push the print fan cable through the opening in the x-carriage-back.

Step 11 Tightening the textile sleeve

Tightening the textile sleeve
Tightening the textile sleeve
Tightening the textile sleeve
Tightening the textile sleeve
Open one end of the textile sleeve and slide it on the cable bundle leading from the extruder.
Leave the cables from the hotend out for now.
Length of the first wrap should be slightly longer than the cable-holder part, about 5 cm is enough.
Gently twist the sleeve to make it smaller and tighter around the cables, orient the sleeve's seam downwards, then slide the sleeve towards the extruder.
Take 3 zip ties and insert them into the lower row of holes on the cable-holder.
Twist the sleeve again (without twisting the cables inside) and tighten the zip ties.
IMPORTANT: Cut the remaining part of each zip tie using pliers as closest to its head as possible. Note the correct position of each zip ties's head (slightly off-centre to the left).

Step 12 Guiding the hotend cables

Guiding the hotend cables
Guiding the hotend cables
Guiding the hotend cables
Guiding the hotend cables
Use two zip ties and push them through the upper slots on the cable-holder.
ATTENTION! Before tightening the zip ties add the cables from the hotend. Use the channel in the printed part to arrange them properly.
Once the hotend cables are included, tighten the zip ties and cut remaining parts.
Open the textile sleeve and insert the cables from the hotend.
Compare the look of the cable management with the last picture.
The zip tie arrangement was tested with the injection molded double spool holder (provided in the kit and assembled later on). If you intend to use any other frame mounted type holder, make sure the zip ties won't crash into it, which might result in a print failure.

Step 14 Guiding the textile sleeve

Guiding the textile sleeve
Guiding the textile sleeve
Guiding the textile sleeve
Guiding the textile sleeve
Guide textile sleeve on the cable bundle from the extruder to the Einsy base.
Slide the sleeve in the holder at least 3/4 of the holder's height.
Ensure the nylon filament isn't pushing the motor cables and if needed slightly unwrap the sleeve and push the filament up.
Use the Extruder-cable-clip and two M3x10 screws to fix the cable bundle in place.

Step 15 Cable management

Cable management
Cable management
Manage all cables in the Einsy base like in the picture.
Secure the cable bundle with two zip ties.

Step 16 It's done!

It's done!
It's done!
It's done!
It's done!
Good job! You just replaced the print fan on your printer.
To ensure everything works as expected and all wires are connected correctly, turn the printer on and run the Selftest from the Calibration menu.
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