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Ships mid-September
Original Prusa® MK4S to CORE One+ (Gen 2) Conversion Kit
$799.00
Includes 1-yr standard manufacturer warranty
Why buy from us?
- Free Shipping: Free domestic shipping on orders over $50.
US-Based Inventory & Support: Stocked and shipped directly from our Wilmington, Delaware facility. - Fast Dispatch: Most orders ship by the next business day.
- Final Price Guarantee: No surprise tariffs, duties, or hidden international fees.
- Need help? Not sure about compatibility or your purchase? Just ask our US-based experts!
Compatible Accessories
Works With Your Original Prusa® MK4S to CORE One+ (Gen 2) Conversion Kit
Conversion Kit
MK4S → CORE One+ (Gen 2) Conversion Kit
Turn your MK4S into a fully enclosed CoreXY printer.
Everything you need to rebuild an Original Prusa MK4S into a Prusa CORE One+ (Gen 2) — the enclosed, actively heated CoreXY machine, with no compromise against a factory-built unit. The result takes up less desk space, prints faster, handles a larger build volume, and runs demanding materials like PC, PCCF and Nylon without warping.
Preorder — expected to ship Mid-September. Order now to hold your place in line.
Before you order — two compatibility checks
- xLCD version. This kit is supplied for the newer xLCD revision. Check which xLCD your MK4S shipped with; if you have the older revision, contact us before ordering and we will include the additional components you need.
- Power supply. The silver PSU is not compatible with the conversion kit.
What the Kit Contains
The conversion kit contains all the parts required to transform your MK4S into a CORE One+ (Gen 2): the all-steel exoskeleton enclosure, the CoreXY motion assembly with GT1.5 belts, the redesigned heatbed mounting, the nozzle wiper, chamber ventilation hardware, the bayonet-style spoolholder, wiring, fasteners and the full assembly guide.
Supplied in the kit
- All-steel exoskeleton enclosure and panels
- CoreXY motion assembly, GT1.5 belts and pulleys
- Redesigned Gen 2 heatbed mounting
- Nozzle wiper and automatic top vent mechanism
- Bayonet-style spoolholder
- Cabling, fasteners and hardware
- Step-by-step assembly manual
Reused from your MK4S
- Print sheets
- Hotend and nozzles
- Nextruder assembly
- Electronics and display (newer xLCD)
- Many other proven MK4S components
The CORE One+ deliberately shares many parts with the MK4S. That is what makes this conversion possible — and what keeps your existing accessories useful.
What You Get Out of It
Fully enclosed CoreXY architecture
CoreXY moves a lightweight print head instead of the heavy bed, so the machine reaches much higher speeds without giving up quality. Input Shaper compensates vibration; travel speeds reach 600 mm/s. The enclosure is structural, not an accessory — the all-steel exoskeleton is what makes that rigidity possible.
The right environment for advanced materials
The compact chamber reaches up to 55 °C quickly, so ASA, ABS, PC, PA (Nylon) and carbon-filled blends print without lifted corners or split layers. Active temperature control and automatic ventilation mean PLA still prints flawlessly with the door closed.
What's New in the Gen 2
- Automatic top vent operation: the extruder opens the vent for low-temperature materials (PLA, PETG) and closes it for high-temperature materials — a genuine set-and-forget thermal environment.
- Easy flex loading: a redesigned filament insertion point makes feeding TPU and other flexibles quick and simple.
- New bayonet-style spoolholder: takes various spool sizes and is ready for a direct-feed drybox.
- GT1.5 belts and nozzle wiper: finer surface finish and a clean nozzle at every print start.
- Redesigned heatbed mounting: removes the separate heat-soak wait for bed temperatures up to 85 °C.
- Firmware: every software improvement developed across the CORE One lifespan, included from the first boot.
Who It's For
- MK4S owners who want an enclosed CoreXY machine without buying a second printer or selling the first.
- Anyone printing engineering materials who is tired of fighting warping on an open-frame printer.
- Print farms and workshops recovering bench space — the CORE One+ footprint is far smaller than an MK4S inside an enclosure.
- People who enjoy the build. This is a full teardown-and-rebuild, in the same spirit as a Prusa assembly kit.
Compatibility & Installation
| Compatible with | Original Prusa MK4S only |
| xLCD revision | Newer xLCD version — contact us if you have the older revision |
| Power supply | Silver PSU is not compatible |
| Result after conversion | Prusa CORE One+ (Gen 2), equivalent to a factory machine |
| Assembly | Full self-build with a step-by-step online manual at help.prusa3d.com |
| Tools | Standard Prusa toolset (Allen and Torx keys, pliers) — not included |
| Reusable parts | Print sheets, hotends, nozzles and many other MK4S components |
Warranty note: consumable parts such as print sheets are not covered by the warranty, since their coatings are expected to wear over time, unless the failure results from a defect in materials or workmanship. Cosmetic damage — scratches, dents, cracks — is likewise not covered.
One printer in, a different printer out
Check your xLCD and PSU, then preorder for mid-September dispatch.
Frequently asked questions
What is the return policy?
Our goal is for every customer to be totally satisfied with their purchase. If this isn’t the case, let us know and we’ll do our best to work with you to make it right.
Are any purchases final sale?
We are unable to accept returns on certain items. These will be carefully marked before purchase.
When will I get my order?
We will work quickly to ship your order as soon as possible. Once your order has shipped, you will receive an email with further information. Delivery times vary depending on your location.
Where are your products manufactured?
Our products are manufactured both locally and globally. We carefully select our manufacturing partners to ensure our products are high quality and a fair value.
How much does shipping cost?
Shipping is calculated based on your location and the items in your order. You will always know the shipping price before you purchase.