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 250 × 220 × 270 mmLARGER BUILD VOLUME 55 °CACTIVELY HEATED CHAMBER ~50% lessDESK SPACE VS. ENCLOSED MK4S 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.