Prusa - Original Prusa i3 MK3S/+ to MK3.9 upgrade kit

MK3.9 contains everything from the MK4 except for the X/Y/Z motors (Nextruder motor is included). You will reuse the frame, PSU and motors from your MK3S+. And if you want, you can additionally buy the new precise MK4 motors (eliminate Vertical Fine Artifacts, 0.9° per step) and complete the upgrade to MK4 later.

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/+

Here is a closer explanation of the difference between the MK3.9 and MK4 upgrade packages:

The only difference is in the stepper motors. The MK4 uses higher-precision stepper motors that help eliminate VFA (Vertical Fine Artifacts) these are tiny surface artifacts that are visible if you closely inspect a printed object. In other words, the motors in the full MK4 upgrade are the cherry on top if youre chasing the highest possible level of quality, they will come in handy. But the MK3.9 upgrade is very close to that.

This product includes:

• 32-bit xBuddy board (same as MK4)
• Metal xBuddy case (and cover)
• xLCD screen (same as MK4)
• Nextruder parts (including E motor)
• Cables for Nextruder, Heatbed, xLCD
• Expansion joints for Heatbed
• New belts for X & Y axes
• Fasteners and other accessories
• Filament for printable parts

Parts kept from your MK3S/MK3S+

• Frame and extrusions (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 motors
• X/Y/Z rods and bearings

*Please note that silver PSU will require a cable adapter.