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Prusa MK3/S/+ to MK3.5 Upgrade Kit

Prusa MK3/S/+ to MK3.5 Upgrade Kit

Prusa Research

Regular price £289.99
Regular price Sale price £289.99
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Supercharge your MK3S and MK3S+!

With the introduction of the MK4, we were looking for ways to bring its features to our proven workhorse, and the MK3.5 upgrade is the answer. It’s the easiest and most affordable option to print two times faster and expand the capabilities of your MK3S/+ 3D printer!

Enjoy benefits such as super-fast printing with the addition of Input Shaper, sending files wirelessly to your machine without using Raspberry Pi, and navigating the printer’s menus faster than ever before with the new large LCD. The upgrade is straightforward to install and with our detailed assembly guide and 3D printing handbook, you’ll be up to speed in no time!

High-speed printing with ease

As a part of the upgrade package, you will receive our new 32-bit embedded xBuddy to expand your 3D printer’s capabilities. The addition of Input Shaper and Pressure Advance brings a massive boost to your MK3S/+, allowing you to print more than twice as fast and with the same level of quality. The prints that would be otherwise running the entire night can be finished in just a few hours.
 

Prusa Connect and easy networking

With the MK3.5 upgrade, you also receive an easy way to connect your printer to your network - both wired and wireless. Add the MK3.5 to Prusa Connect, our internally developed remote print management solution, and start sending print files to your printer without the need to deal with USB drives. G-code streaming enables you to start printing mere seconds after you upload the file to the Prusa Connect cloud. However, Prusa Connect can do even more. Check out our article to learn all about it!



Plenty of quality-of-life improvements

It’s time to replace the old segmented LCD with a brand new one. This 3.5’’ color LCD gives you much better control over your printer. See print file previews, read detailed instructions, or scan QR codes - using the printer is now much more convenient. With the new electronics and the new LCD, you can now use standard USB flash drives for storing G-codes, and you can also use a USB drive to flash new firmware (but you can also do it remotely via Prusa Connect). You can customize which information is displayed at all times in the footer of the LCD screen.

 

Ready for multi-color printing with MMU3

MK3.5 can be enhanced by an optional add-on that allows your single-extruder printer to print with up to 5 colors (materials) at the same time. The MMU3 contains five filament insertion points. Load the five colors of your choice, slice the object with MMU3 profile in PrusaSlicer and start the print. The system automatically selects filament using the selector, loads it into the Extruder and the MK3.5 starts printing. When it’s time to change the color or material, it also happens automatically.

The MMU3 is the latest edition of Multi Material printing device by Prusa Research. The firmware has been rewritten completely, we have redesigned the plastic parts, added more robust metal parts, improved the electronics and updated the filament buffer. All of these changes have improved the reliability and user comfort to levels where MMU has never been before.

To get MMU3 for your MK3.5 printer, you can choose from the following options:

Easy to install

The MK3.5 upgrade is easy to install - we’re providing detailed assembly instructions in seven languages and an updated 3D printing handbook to get you started. You don’t have to worry about getting stuck. Everything has been thoroughly tested in-house. You’ll start printing in no time!

 

PSU & Heatbed info

Before you order the upgrade, please check which PSU your printer came with and which version of the heatbed connector is installed. This is important for correct compatibility with the upgrade. Depending on the selected options, we can send you additional components to ensure compatibility with the upgrade.

 

psu comparison foto

Which PSU does your printer have?

  • Black PSU - you are all good
  • Silver PSU - you will need to add a compatible wiring harness or a black PSU (in the configuration box above)
heatbed comparison foto

How many screws does your heatbed have?

  • 2+3 screws (power cable connected with screws) - you are all good
  • 2+1 screws (power cable soldered) - replacing the bed will be necessary
Be sure to choose the correct options in the top right menu before you place your order!

Package Includes

This product is supplied as a kit - you must assemble it yourself!

Printed parts are NOT included! Please print them before you disassemble your MK3S/+! The filament is included in the upgrade package.

Important: The black injection-molded spool holder is not part of the upgrade package. If your printer didn't come with it (early revisions of MK3), you can purchase it here.

This product includes:

  • 32-bit xBuddy board (same as MK4)
  • Metal xBuddy case (and cover)
  • xLCD screen + cables (same as MK4)
  • Cable adapters for your current extruder and heatbed
  • Expansion joints for Heatbed
  • Fasteners and other accessories
  • Filament for printable parts

Parts kept from your MK3S/MK3S+

  • Extruder with V6 hotend
  • Frame and extrusions (the new MK4 has just a different look)
  • PSU* (same wattage/voltage as MK4)
  • Heatbed MK52 24V (thermistor and power cables will be changed)
  • X/Y/Z/E motors
  • X/Y/Z rods and bearings
 

MK3S/+ Upgrades Comparison

  MK3.5 upgrade MK3.9 upgrade MK4 upgrade

Build volume

250 x 210 x 210 mm | 9.84 x 8.3 x 8.3 in 250 x 210 x 210 mm | 9.84 x 8.3 x 8.3 in 250 x 210 x 220 mm | 9.84 x 8.3 x 8.6 in
Mainboard Custom 32-bit xBuddy electronics with STM32 Custom 32-bit xBuddy electronics with STM32 Custom 32-bit xBuddy electronics with STM32
Stepper Drivers Trinamic 2130 Trinamic 2130 Trinamic 2130
Stepper motors Regular 1.8° X,Y stepper motors Regular 1.8° X,Y stepper motors Precise 0.9° X,Y stepper motors (prevents VFA)
MMU3 support

Yes

Yes

Yes

Extruder electronics

No

Custom breakout board for connecting fans, thermistors and other parts. Custom breakout board for connecting fans, thermistors and other parts.
Filament path Aluminum heatsink, all-metal hotend Aluminum heatsink, all-metal hotend Aluminum heatsink, all-metal hotend
Drive system

Direct drive

Nextruder Planetary Gear System, 10:1 gearbox ratio Nextruder Planetary Gear System, 10:1 gearbox ratio
First layer calibration Manual adjust Z Fully automatic (thanks to the Load Cell sensor) Fully automatic (thanks to the Load Cell sensor)
Quick-Swap nozzle system

No

Yes

Yes

LCD screen 3.5″ graphic 65k color screen 3.5″ graphic 65k color screen 3.5″ graphic 65k color screen
Bed calibration

Automatic, Mesh Bed Leveling

Automatic, Mesh Bed Leveling (only on print area) Automatic, Mesh Bed Leveling (only on print area)
One-click Printing

Yes

Yes

Yes

Status LEDs

Yes

Yes

Yes

Input shaper

Yes

Yes

Yes

Filament Sensor

Yes (IR)

Yes (built-in Hall sensor) Yes (built-in Hall sensor)
Loadcell sensor

No

Yes

Yes

Advanced sensors

3 thermistors + SuperPINDA, fan RPM sensors

Filament sensor, Loadcell sensor, Power panic, 4 high-precision thermistors (genuine Semitec) + fan motors RPM monitoring Filament sensor, Loadcell sensor, Power panic, 4 high-precision thermistors (genuine Semitec) + fan motors RPM monitoring

Power panic

Yes

Yes

Yes

Ethernet connection

Yes

Yes

Yes

Wi-Fi connection

Yes

Yes

Yes

Prusa Link Integrated Integrated Integrated
Print medium USB drive / LAN / internet via Prusa Connect USB drive / LAN / internet via Prusa Connect USB drive / LAN / internet via Prusa Connect

Firmware update interface

USB drive USB drive USB drive
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