United StatesOriginal Prusa i3 MK3/S/+ to MK3.5 upgrade kit
MK3.5 upgrade contains the xBuddy board and new LCD, gives your MK3 the new 32-bit electronics, new connectivity options, Prusa Connect support, and also Input Shaper and Pressure Advance for high-speed printing. Nextruder is not included.
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 (in the configuration box above)
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.
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
*Please note that silver PSU will require a cable adapter. More information will be provided later.
MK3S/+ Upgrades Comparison
| MK3.5 upgrade | MK3.9 upgrade | MK4 upgrade | |
Build volume |
250 x 210 x 210 mm | 9.84 x 8.3 x 8.3 in | 250 x 210 x 220 mm | 9.84 x 8.3 x 8.6 in | 250 x 210 x 220 mm | 9.84 x 8.3 x 8.6 in |
| Mainboard | Custom 32-bit xBuddy electronics with STM32 | Custom 32-bit xBuddy electronics with STM32 | Custom 32-bit xBuddy electronics with STM32 |
| Stepper Drivers | Trinamic 2130 | Trinamic 2130 | Trinamic 2130 |
| Stepper motors | Regular 1.8° X,Y stepper motors | Regular 1.8° X,Y stepper motors | Precise 0.9° X,Y stepper motors (prevents VFA) |
| MMU3 support | Yes |
Yes |
Yes |
| Extruder electronics | No |
Custom breakout board for connecting fans, thermistors and other parts. | Custom breakout board for connecting fans, thermistors and other parts. |
| Filament path | Aluminum heatsink, all-metal hotend | Aluminum heatsink, all-metal hotend, no PTFE tube | Aluminum heatsink, all-metal hotend, no PTFE tube |
| Drive system | Direct drive |
Nextruder Planetary Gear System, 10:1 gearbox ratio | Nextruder Planetary Gear System, 10:1 gearbox ratio |
| First layer calibration | Manual adjust Z | Fully automatic (thanks to the Load Cell sensor) | Fully automatic (thanks to the Load Cell sensor) |
| Quick-Swap nozzle system | No |
Yes |
Yes |
| LCD screen | 3.5″ graphic 65k color screen | 3.5″ graphic 65k color screen | 3.5″ graphic 65k color screen |
| Bed calibration | Automatic, Mesh Bed Leveling |
Automatic, Mesh Bed Leveling (only on print area) | Automatic, Mesh Bed Leveling (only on print area) |
| One-click Printing | Yes |
Yes |
Yes |
| Status LEDs | Yes |
Yes |
Yes |
| Input shaper | Yes |
Yes |
Yes |
| Filament Sensor | Yes (IR) |
Yes (built-in Hall sensor) | Yes (built-in Hall sensor) |
| Loadcell sensor | No |
Yes |
Yes |
| Advanced sensors | 3 thermistors + SuperPINDA, fan RPM sensors |
Filament sensor, Loadcell sensor, Power panic, 4 high-precision thermistors (genuine Semitec) + fan motors RPM monitoring | Filament sensor, Loadcell sensor, Power panic, 4 high-precision thermistors (genuine Semitec) + fan motors RPM monitoring |
Power panic |
Yes |
Yes |
Yes |
Ethernet connection |
Yes |
Yes |
Yes |
Wi-Fi connection |
Yes |
Yes |
Yes |
| Prusa Link | Integrated | Integrated | Integrated |
| Print medium | USB drive / LAN / internet via Prusa Connect | USB drive / LAN / internet via Prusa Connect | USB drive / LAN / internet via Prusa Connect |
Firmware update interface |
USB drive | USB drive | USB drive |
Kit price |
249 USD / 279 EUR (VAT incl.) | 499 USD / 549 EUR (VAT incl.) | 579 USD / 639 EUR (VAT incl.) |
| Buy MK3.5 upgrade | Buy MK3.9 upgrade | Buy MK4 upgrade |
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