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How to replace a heatbed set (MINI/MINI+)

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How to replace a heatbed set (MINI/MINI+)

How to replace a heatbed set (MINI/MINI+)
Relevant for:
Last updated 3 months ago
How to replace a heatbed set (MINI/MINI+)
 Difficulty
Easy
 Steps
17
 Available languages
ENCSPLDEESITFR

Step 1 Introduction

Introduction
Introduction
This guide will take you through the replacement of the heatbed set on the Original Prusa MINI and MINI+.
Some parts might be slightly differ. However, it does not affect the procedure.
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.

Step 3 Opening the box with the electronics

Opening the box with the electronics
Opening the box with the electronics
Opening the box with the electronics
Turn the printer off and unplug it from the socket!
Wait till the heatbed is cold!
Release and remove the M3 screw on the box with the electronics.
Remove the cable cover.
Lift the second electronics cover slightly. Before you remove it completely, pull it first towards the vertical aluminium extrusion to release both pins from the holes.

Step 4 Disconecting the heatbed

Disconecting the heatbed
Disconecting the heatbed
Disconecting the heatbed
Disconnect the heatbed cable.
Press the safety pin on the connector and disconnect the heatbed thermistor cable from the electronics board.

Step 5 Removing the heatbed

Removing the heatbed
Removing the heatbed
Move the Y-carriage all the way to you.
Release and remove 9 screws on the heatbed by using a Torx TX10 key.
Keep all the screws for the next steps.
Remove the heatbed from the printer.

Step 6 Heatbed: parts preparation

Heatbed: parts preparation
Heatbed: parts preparation
Heatbed: parts preparation
For the following steps, please prepare:
Heatbed MINI/MINI+ (1x)
Heatbed cable (1x)
MINI-heatbed-cable-top (1x)
MINI-heatbed-cable-bottom (1x)
Textile sleeve 5x350 mm (1x)
M3x4b Countersunk screw (9x)
The list continues in the next step...

Step 8 Assembling the heatbed

Assembling the heatbed
Assembling the heatbed
Assembling the heatbed
Assembling the heatbed
Insert two M3x8 screws into the heatbed. Screw heads must be on the top surface of the heatbed.
Turn the heatbed bottom up and place it like in the picture.
Place the red wire (+) on the left screw.
Place the black wire (-) on the right screw.
Attach two M3nN nuts onto both screws and tighten them firmly.
The cable cover, which will be applied later requires the connectors to be slightly inclined towards each other. Hold them in the position as seen in the picture while tightening, but leave a small gap between them. Ensure the cable lugs cant move after tightening.
Make sure the cables are connected properly and the screws are tightened fully. Improper wiring or losing connection to the heatbed can fatally damage the electronics.

Step 9 Guiding the heatbed cables

Guiding the heatbed cables
Guiding the heatbed cables
Guiding the heatbed cables
Guide the black thermistor cable between the heatbed cables.
Wrap the thermistor cable a few times around the heatbed cables (see the photo).

Step 10 Covering the heatbed cables

Covering the heatbed cables
Covering the heatbed cables
Covering the heatbed cables
Insert the M3nN nut into the MINI-heatbed-cable-cover-bottom.
Place the MINI-heatbed-cable-cover-bottom in the bottom of the heatbed cable connectors.
Make sure the connectors fit properly into the cover.
Wrap the textile sleeve around the heatbed cable bundle. Slide the sleeve into the cover as far as possible.

Step 11 Covering the heatbed cables

Covering the heatbed cables
Covering the heatbed cables
Covering the heatbed cables
Covering the heatbed cables
Slightly tilt the MINI-heatbed-cable-cover-top and slide it over the screw heads on the connectors.
Push the cover to fit properly the bottom part of the cover.
Secure it with the M3x12 screw.

Step 13 Mounting the assembled heatbed

Mounting the assembled heatbed
Mounting the assembled heatbed
Mounting the assembled heatbed
Mounting the assembled heatbed
Push the Y-carriage to the front and place the Heatbed behind.
Place the heatbed on the Y-carriage.
Align all 9 holes on the heatbed with the heatbed spacers.
Insert the M3x4b screws in the holes. Don't fully tighten the screws.
After all screws are in place, use the Torx key to tighten them in the following order:
Center screw
First four screws (edges)
Last four screws (corners)

Step 14 Connecting the heatbed cable

Connecting the heatbed cable
Connecting the heatbed cable
Connecting the heatbed cable
Connect the heatbed thermistor cable in the lower connector on the Buddy board.
Connect the heatbed cable in the lower green connector on the Buddy board.

Step 15 Covering the electronics

Covering the electronics
Covering the electronics
Covering the electronics
Covering the electronics
Before covering the electronics, make sure the square nut is correctly positioned in the printed part. The nut must not fall out! This can cause fatal damage to the electronics.
Insert the cover back in and make sure it is properly seated in the slot. Note: on an older design, there were holes instead of slots, the assembly procedure is the same.
Place the second cover on the top and arrange the cables:
Extruder bundle, ensure the textile sleeve is partially in. Also, it must be tilted away from the printer.
Heatbed bundle, ensure the textile sleeve is partially inside the box.
Filament sensor cable (optional), ensure that the textile sleeve wrapped around the cables is partially inside the box.
Now, tighten the second cover. Check that no cable is pitched.

Step 16 Final check

Final check
Final check
Final check
Final check
Connect the printer and turn it ON.
Use the knob and navigate to the Preheat in the Menu.
Select PLA.
Navigate to the Info screen and check if the temperature rises.

Step 17 It's done!

It's done!
It's done!
Good job! You just replaced the heatbed on your Original Prusa MINI printer.
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