Before you order the upgrade, please check which PSU your printer came with and which version of the heatbed connector is installed. This kit only works if you have the black power supply and not a silver power supply. Your heatbed must have screws and is NOT solder on.

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.

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.

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

*Frame and heatbed are not included upgrade, because replacing these parts brings no funcional advantage and would only increase the price of the upgrade. If for some reason you still want a new frame (it has hexagons on the other side), it will be available on the eshop as a spare part.

**Please note that silver PSU will require a cable adapter. More information will be provided later.