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Prusa MK3S+ to Prusa MK4S Conversion Kit

Ref.: PRUSA-UPGR-MK3MK4.N1

738.00 €

Tax excl.

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Description

The Prusa MK4S Upgrade Kit is designed for users who want to upgrade their MK3S/MK3S+ series 3D printer to a higher level of performance and precision. This kit provides a complete transition, offering significant improvements in electronics, mechanics, and overall system reliability.

Before requesting the upgrade, it is essential to check which power supply is installed on your printer and which version of the heated bed connector is present. This step is crucial to ensure proper compatibility. Depending on the selected options, additional components may be supplied to guarantee seamless integration with the kit.

Power Supply Compatibility

There are two versions of power supplies present in the original printers:

Black and silver power supplies

Image 1: Power supply in black and silver versions. Source: Prusa3D

Black power supply: fully compatible, no additional changes required.
Silver power supply: a compatible cable harness must be added or replaced with a black power supply.

Heated Bed Compatibility

It is also important to check the type of connection on the heated bed:

Heated bed connection types

Image 2: 2+3 screw bed connection (left) and 2+1 screw bed connection (right). Source: Prusa3D

Bed with 2+3 screws: ready for upgrade, no modifications required.
Bed with 2+1 screws: the bed must be replaced to ensure proper operation.

It is recommended to correctly select the options in the configurator before placing the order to ensure full kit compatibility with the printer.

The frame and the MK52 heated bed are not included, as replacing them provides no functional advantage. However, these items can be purchased as spare parts if needed.

Differences Between Upgrade Packages

The main difference between the MK3.9 and MK4 upgrade packages lies in the stepper motors. The MK4 features higher precision motors (0.9°) that reduce fine vertical artifacts (VFA), achieving superior print quality. The MK3.9 version, while slightly lower in this aspect, still provides results very close to the maximum level.

Comparison of Improvements

Feature	MK3.5S Upgrade	MK3.9S Upgrade	MK4S Upgrade
360° High-Performance Cooling	No	Yes	Yes
High-Flow Nozzle	No	Yes	Yes
Print Volume	250 x 210 x 210 mm	250 x 210 x 220 mm	250 x 210 x 220 mm
Mainboard	xBuddy 32-bit with STM32	xBuddy 32-bit with STM32	xBuddy 32-bit with STM32
Stepper Motors	1.8° Standard	1.8° Standard	0.9° High-Precision
MMU3S Compatibility	Yes	Yes	Yes
First Layer Calibration	Manual	Automatic	Automatic
Quick Nozzle Change System	No	Yes	Yes
Display	3.5” Color LCD	3.5” Color LCD	3.5” Color LCD
Wi-Fi and NFC Connectivity	No	Yes	Yes

Important Information

This product is supplied as a kit, so the user must perform the complete installation. The black injection-molded spool holder is not included.

The MK4S upgrade not only extends the printer’s lifespan but also provides access to more robust printing technology with optimized thermal control, high-precision extrusion, and advanced connectivity. All of this makes the kit an ideal investment for those seeking the highest printing quality.