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CORE One+ (Gen 2) upgrade kit - for Original Prusa MK4S 3D printer - self-assembly - new xLCD version
An upgrade kit from the MK4S to the CORE One+ (Gen 2): turns your Original Prusa MK4S into an enclosed CoreXY 3D printer with a chamber up to 55 °C. The version for MK4S printers with the newer xLCD display electronics and a black power supply, not the silver one.
- Build volume 250 x 220 x 270 mm instead of 250 x 210 x 220 mm
- The bed plates, hotends and nozzles from your MK4S stay
- Automatic vent, easy loading of flexible filaments
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The promotional price does not combine with quantity discounts.
Your MK4S as an enclosed CoreXY printer
The CORE One+ (Gen 2) upgrade kit contains the parts that turn a Prusa MK4S printer into an enclosed CoreXY 3D printer with a steel frame and a chamber up to 55 °C. CoreXY kinematics and a high-flow nozzle speed up printing without losing print quality.
After assembly the printer is faster, takes up less space than an enclosed MK4S and prints in a larger build volume of 250 x 220 x 270 mm. The enclosed chamber heats up to 55 °C, so you can print ASA, ABS, polycarbonate and nylon without warping the model's edges.
This offer covers the kit for printers with the newer version of the xLCD display. We also offer the Prusa CORE One+ (Gen 2) for self-assembly.
250 x 220 x 270 mm
build volume after the upgrade
55 °C
max. enclosed chamber temperature
30 %
larger build space than the MK4S
50 %
less space than an enclosed MK4S
Assembling the steel CORE One+ frame on a workbench
Assembly based on parts from your MK4S
The Prusa CORE One+ reuses many proven Original Prusa MK4S parts, which is exactly why the upgrade is possible at all. You move the bed plates, hotends, nozzles and many other components over from the old printer, and the kit supplies everything else.
The manual guides you through the process: from reviewing the MK4S and disassembly, through assembling the base, bed, CoreXY axes and print head, to the enclosure, door, display and first calibration. The manufacturer rates the assembly as moderate difficulty.
The new frame is a steel exoskeleton in which the enclosure is part of the structure and stiffens the whole printer. The design has no glued parts, so every component can be removed and replaced, which makes the printer easy to service and modify.
What is new in the Gen 2 generation
The Gen 2 generation of the kit takes over proven hardware improvements from the CORE One L printer and all the software updates released since the CORE One launch:
- Automatic vent: open for PLA and PETG, closed for ABS or ASA
- Easy loading of flexible filaments: a new filament entry point
- Bayonet spool holder: for spools of various sizes, ready for a dry box
The Nextruder head has print cooling from every side (360°), which according to the manufacturer lets you print overhangs at a 75° angle cleanly. The force sensor calibrates the first layer automatically, and factory-prepared profiles cover over 200 filaments.
Connecting the Nextruder head cables
Is it right for you?
A good choice if:
- you want to print in an enclosed chamber
- you want to reuse the plates, hotends and nozzles you already have
- you plan to print with ASA, ABS, polycarbonate or nylon
Consider another option if:
- you do not have an MK4S: choose the CORE One+ (Gen 2) printer for self-assembly
- you do not want to assemble anything: choose the assembled CORE One+ (Gen 2)
What changes compared with the MK4S
| Change | What it means |
|---|---|
| Build volume: 250 x 210 x 220 mm → 250 x 220 x 270 mm | 10 mm more on the Y axis and 50 mm on the Z axis, so taller models in one piece |
| Chamber: none (optional enclosure, up to 45 °C) → built in, up to 55 °C | active chamber temperature control when printing ASA, ABS, PC and nylon |
| Frame: aluminum profiles → steel exoskeleton | the enclosure is part of the structure and stiffens the printer |
| Sensors: 1 filament sensor, 4 thermistors → 2 sensors, 5 thermistors, door sensor | the printer watches the filament in two places and knows whether the door is closed |
| Lighting: RGB strip by the display → chamber lighting and RGB strips by the bed and display | an illuminated chamber and status signaling with RGB strips |
Frequently asked questions
Does the kit fit the MK4?
No. The manufacturer states that the kit is compatible only with the Original Prusa MK4S. From the MK4S you move to the CORE One+ directly, without other upgrades.
How do I check my xLCD version?
Compare your MK4S display with the manufacturer's photos of the newer and older xLCD. This kit fits the newer version, the older one needs a different variant.
I have a silver power supply. Now what?
Before the upgrade, replace it with a black power supply together with the matching cables. The manufacturer states that moving from the MK4S to the CORE One+ is possible only with a black power supply in your printer.
Can I use my plates and nozzles?
Yes. The CORE One+ uses many parts of the MK4S, so your existing bed plates, hotends and nozzles will also keep working in the new CORE One+ printer after the upgrade.
Can I print ABS and ASA?
Yes. The chamber heats up to 55 °C, which limits warping. For printing ABS, ASA, HIPS and PA, the manufacturer recommends the optional air filtration system.
Does CORE One+ support MMU3?
Yes. With the MMU3 module you can print with one nozzle using up to five different filaments, and the waste from each color change goes into a single compact block.
CORE One+ (Gen 2) specifications after the upgrade
| Parameter | Value |
|---|---|
| Kit compatibility | Original Prusa MK4S with a black power supply, newer xLCD version |
| Build volume | 250 x 220 x 270 mm |
| Kinematics | CoreXY, enclosed chamber |
| Frame | steel exoskeleton |
| Filament diameter | 1.75 mm |
| Layer height | 0.05 mm to 0.3 mm |
| Extruder | Nextruder, direct drive, 10:1 planetary gearbox |
| Hotend | all-metal, aluminum heatsink, E3D V6 compatibility via an adapter |
| Nozzle | brass CHT high-flow, 0.4 mm |
| Print cooling | turbine, 360° cooling |
| Max. nozzle temperature | 290 °C |
| Max. bed temperature | 120 °C |
| Max. chamber temperature | 55 °C |
| Mainboard | 32-bit xBuddy with an STM32 chip |
| Motor drivers | Trinamic 2130 |
| X and Y axis motors | 0.9° stepper |
| Calibration | automatic first-layer calibration (force sensor), bed leveling mesh |
| Motion features | Input Shaper, Phase Stepping |
| Sensors | 2 filament sensors, force sensor, 5 Semitec thermistors, fan speed monitoring, door sensor |
| Print surface | magnetic bed with removable PEI steel sheets |
| Display | 3.5", color, touchscreen |
| Connectivity | Ethernet, NFC, detachable ESP Wi-Fi module |
| File source | USB drive, LAN, Prusa Connect, Prusa app |
| Materials | PLA, PETG, Flex, PVA, PC, PP, CPE, PVB; with the optional filtration system also ABS, ASA, HIPS, PA |
| Power supply | 240 W, Delta, with power loss protection (Power Panic) |
| Power consumption | 90 W (PLA), 110 W (ABS) |
| Printer dimensions | 415 x 444 x 555 mm |
| Manufacturer | Prusa Research |
| Printer weight | 22.5 kg |
Useful links
| Name | Value |
|---|---|
| Width | 49 cm |
| Height | 59 cm |
| Depth | 43 cm |
| Weight | 23.3 kg |
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30 days to return, without giving a reason
If the product does not meet your expectations, you have 30 days from receiving the parcel to withdraw from the contract. The product only has to be complete. The right of return belongs to consumers (a purchase unrelated to business activity).
Complaints
If the product turns out to be faulty, you can make a claim under the guarantee or the statutory warranty. We handle claims without delay, at the latest within 14 working days of receiving the report together with the goods.
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