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How to access and clean the extruder-pulley (MINI/MINI+)

How to access and clean the extruder-pulley (MINI/MINI+)

How to access and clean the extruder-pulley (MINI/MINI+)
Relevant for:
Last updated a year ago
How to access and clean the extruder-pulley (MINI/MINI+)
 Difficulty
Moderate
 Steps
13
 Available languages
CSDEESFRITJAPL

Step 1 Introduction

Introduction
Introduction
This guide will take you through the access and clean the extruder-pulley on the Original Prusa MINI and MINI+.
Some parts might slightly differ. However, it does not affect the procedure.
Before you proceed with the disassembly, make sure you have tried to clean the gears using the "inspection door" on the top. See the MINI Handbook, Chapter "Regular Maintenance" available at prusa3d.com/drivers

Step 2 Tools and fasteners necessary for this guide

Tools and fasteners necessary for this guide
Tools and fasteners necessary for this guide
Tools and fasteners necessary for this guide
Wrench size 10 mm (1x)
Allen key 2.5 mm (1x)
Steel brush (1x)
Cloth or piece of fabric 15x15cm (1x)
The cloth will be used to protect the heatbed. You can use any similar material.

Step 3 Preparing the printer

Preparing the printer
Preparing the printer
Make sure that:
The filament is unloaded from the printer.
The printer parts - print head and heatbed are cooled down at room temperature!!!
The printer is turned off and unplugged from the socket.

Step 4 Protecting the heatbed

Protecting the heatbed
Protecting the heatbed
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 6 Disassembly of the extruder

Disassembly of the extruder
Disassembly of the extruder
Disassembly of the extruder
Release and remove two screws from the extruder.
Remove the inspection-door.
Keep all the removed fasteners and printed parts for later use.

Step 7 Disassembly of the extruder

Disassembly of the extruder
Disassembly of the extruder
Disassembly of the extruder
Hold the extruder in your hand.
Release and remove the lower screw.
Carefully place the extruder on a piece of cloth on the heatbed so that the motor faces down.
If the extruder does not reach to the heatbed, move the Z-axis down or the X-axis closer. Do it manually, no need to turn the printer on.

Step 8 Extruder surgery

Extruder surgery
Extruder surgery
Extruder surgery
Release and remove three screws on the top side of the extruder-rear part.
Remove the extruder-rear.
Pull out the pulley from the "extruder-front" part.

Step 9 Extruder surgery

Extruder surgery
Extruder surgery
Extruder surgery
Use the steel brush to remove filament residues in the jagged groove on the pulley.
Check the "extruder-rear" part for any impurities in the filament hole.

Step 10 Installing the pulley

Installing the pulley
Installing the pulley
Installing the pulley
Place the pulley back into the bearing. The longer part with the jagged groove must face up. See the picture.
The gears must be aligned properly. Rotate with one pulley to ensure the second is moving as well.
Make sure there are no filament residues and other debris around the gears. The area must be clean.

Step 11 Reassembly of the extruder

Reassembly of the extruder
Reassembly of the extruder
Reassembly of the extruder
Reassembly of the extruder
Place the extruder-rear on the extruder-front part. Check the correct orientation of the parts as shown in the picture.
The pulley shaft must fit in the bearing.
Secure both parts with three M3x25 screws.

Step 12 Mounting the extruder

Mounting the extruder
Mounting the extruder
Mounting the extruder
Mounting the extruder
Place the extruder on the Z-carriage and secure it with the M3x25 screw in the lower hole.
Place the inspection-door to the extruder.
Make sure the holes are aligned.
Secure it with the M3x25 screw, but don't overtighten. You have to be able to open the door.
Insert and tighten the M3x25 screw into the right hole.

Step 13 Mounting the PTFE tubes

Mounting the PTFE tubes
Mounting the PTFE tubes
Mount the upper fitting with the PTFE tube and tighten it using the wrench. Do not over-tighten the fitting, you might deform it!
Great job, it's done!
Heat the printer up and try it out ;)
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