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

Free shipping in Canada for orders over $140 before tax. (via Canada Post)

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.

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

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

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.

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.

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 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.

MK3S/+ Upgrades Comparison

Buy an Original Prusa i3 MK3/S/+ to MK4 upgrade kit for your 3D Printer from Spool3D for your 3D printer in Canada without the surprise cost of the exchange rate!