Original Prusa i3 MK3/S/+ to MK4 upgrade kit

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

***Any Orders will be processed in December***

This is the full kit that includes the MK4's state-of-the-art X/Y motors (400 steps, only 0.9° per step - woah!).

Before ordering the upgrade, verify the PSU your printer has and what version of the heatbed connector is installed. This is essential for successful compatibility with the upgrade. Depending on the chosen options, we may send you additional parts to guarantee compatibility with the upgrade.

1. 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.

2. 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

Printed parts are NOT included! Before dismantling your MK3S/+, be sure to print the parts provided in the upgrade package, which also includes filament.

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 you’re chasing the highest possible level of quality, they will come in handy. But the MK3.9 upgrade is very close to that.

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 you’re chasing the highest possible level of quality, they will come in handy. But the MK3.9 upgrade is very close to that. The MK4 upgrade uses advanced stepper motors, taking print accuracy to the next level and creating smoother, finer finishes. If you're looking to impress with the highest quality results, this upgrade is the cream of the crop. You won't be disappointed with the MK3.9 upgrade, either.

*****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
• 10 mm smooth rods (Z-axis)
• X/Y/Z motors
• Expansion joints for Heatbed
• New belts for X & Y axes
• Fasteners and other accessories
• Filament for printable parts

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
• 10 mm smooth rods (Z-axis)
• X/Y/Z motors
• 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 rods and bearings

*Frame & heatbed aren't included in the upgrade as adding these wouldn't improve performance, & just raise the cost. If you'd like a new frame though (it has hexagons on the other side), it's available on the eshop as a spare part.

**Please be aware that the silver PSU will need an adapter. Additional details will be available shortly.

MK3S/+ Upgrades Comparison