Prusa Core One
Prusa's enclosed CoreXY — fast modern motion built by the most open mainstream vendor in desktop 3D printing. It is the printer that answers the closed speedsters on their own terms while keeping the firmware, hardware and slicer open and the machine genuinely repairable.
If you want a modern enclosed CoreXY without giving up control of your machine, the Core One is the obvious pick. The firmware is open (Prusa's Buddy, a Marlin fork), the Buddy mainboard is a documented STM32 platform, the slicer is open, and the whole thing is built to be repaired with published guides and commodity-friendly parts. The trade is not openness — it is that you pay more than a comparable Bambu or Creality and Prusa moves to market more deliberately, and the AI tooling is deliberately modest. For makers who want speed and to own the stack, this is the open answer.
What it is
The Core One is Prusa Research's enclosed CoreXY FDM printer — a clean break from the bed-slinger lineage of the i3 MK-series. It pairs a rigid CoreXY motion system with a fully enclosed chamber and a build volume in the region of 250 mm cubed, and uses firmware-side input shaping and pressure advance to print quickly without ringing. In other words, it competes in the same fast-and-quiet class as the Bambu and the speedier Creality machines, but from Prusa's open-hardware tradition.
It runs Prusa's own Buddy firmware on the Prusa Buddy control board, ships with a colour screen and the network features Prusa users expect, and slices through PrusaSlicer. The enclosure makes higher-temperature engineering materials such as ABS and ASA far more practical than an open frame allows. Existing MK4-class owners will find the toolhead, sensors and tuning lineage familiar.
Openness
This is the heart of the review, and it is where the Core One leads its class. We score machines on how open they are, and Prusa is the rare mainstream vendor that scores well on almost every axis.
- Firmware — open. The Core One runs Prusa's Buddy firmware, which is a fork of Marlin's lineage and developed in the open on GitHub. You can read the source, follow changes, and the firmware is not a signed black box you simply accept from a vendor. That alone separates it from the closed speedsters.
- Mainboard — Prusa Buddy, STM32. The controller is the Prusa Buddy board, built on a standard STM32 microcontroller. It is a documented, well-understood platform rather than a proprietary controller designed to lock out third-party work, which is exactly what keeps a machine modifiable and repairable years into its life.
- Klipper — open firmware stock, with community ports. Out of the box the Core One runs Prusa's open Buddy firmware, so you already have an open, inspectable control stack and firmware-side input shaping without flashing anything. For people who specifically want Klipper, community ports and projects exist for Prusa's Buddy-based machines; treat them as community efforts with the usual caveats rather than a vendor-blessed path. The key point is that the stock firmware is itself open.
- Slicer — open. The Core One slices through PrusaSlicer, which is open-source and the upstream ancestor of much of the modern open-slicer world — OrcaSlicer itself descends from it. You are not pushed through a closed slicer or a mandatory vendor account to prepare a print.
- Ecosystem — open and repairable. Prusa publishes assembly and repair guides, sells spare parts down to the component, and designs its machines to be fixed rather than replaced. There is no cloud lock-in — Prusa Connect is available if you want remote monitoring, but the printer does not depend on a vendor cloud to function. You own the machine, the firmware and the right to repair it.
Read fairly, the Core One is the open counterweight to the walled-garden trend. Where a closed speedster gives you polish at the cost of the stack, Prusa gives you a comparably modern machine while keeping the firmware, hardware and slicer open and the printer serviceable. If owning and fixing your tools matters, this is the class leader.
AI tooling
Here we will be honest rather than generous: AI is not where the Core One competes. It does not ship the lidar-and-AI-camera inspection suite that defines the top closed machines — there is no built-in AI inspection camera in the mould of the Bambu X1's first-layer scanning and spaghetti detection. The Core One leans instead on solid sensor-based reliability — automatic calibration, load and crash detection, sane defaults — to make prints succeed, rather than on a camera-driven AI layer watching the plate.
If on-device AI failure detection and first-layer scanning are the specific reason you are buying, this is not the machine that delivers them, and we would rather say so plainly. What you get instead is an open platform: because the firmware is open and the board documented, the community is free to build monitoring and detection on top of it without fighting a locked system. That is a different bet — openness over a polished built-in AI suite — and the Core One makes it deliberately.
Where it wins
- Openness, end to end. Open firmware, a documented STM32 board and the open PrusaSlicer — the whole stack is inspectable and yours. This is the headline reason to choose it.
- Repairability and support. Published repair guides, granular spare parts and Prusa's well-regarded support mean a worn or broken machine is fixed, not retired. Few mainstream vendors match this.
- PrusaSlicer. A mature, open, widely trusted slicer with profiles tuned for the machine — and the upstream that much of the open-slicer ecosystem is built on.
- Enclosed for ABS / ASA. The chamber makes higher-temperature engineering materials practical, where an open-frame printer struggles with warping and layer adhesion.
- Modern CoreXY speed. Firmware input shaping and a rigid CoreXY frame put it in the fast, quiet class rather than the slow bed-slinger past.
Where it's limited
- Price. It typically costs more than a comparable Bambu or Creality machine. You are paying for openness, support and repairability, which is a fair trade — but it is a real one.
- Slower to market. Prusa moves deliberately, so it reached enclosed CoreXY after the closed speedsters had already defined the category. You are buying into a mature open answer, not the first mover.
- Minimal AI tooling. No AI inspection camera or lidar-style first-layer scanning; the AI feature list is short by design compared with the top closed machines.
Who it's for
Makers, engineers and shops who want modern enclosed CoreXY speed without surrendering the stack. If you value open firmware, a documented board, an open slicer, the right to repair and freedom from cloud lock-in — and you are willing to pay a premium over a closed speedster for it — the Core One is the clearest open pick in its class. If your priority is the lowest price or a camera-driven AI inspection suite, a closed machine like the Bambu P1 may suit you better, at the cost of the openness this site cares about. Many workshops keep an open Prusa precisely so that one machine in the room is always fully theirs.
Specs & links
- Type: enclosed CoreXY FDM printer.
- Build volume: around 250 mm cubed (an enclosed chamber for ABS / ASA).
- Kinematics: CoreXY with firmware-side input shaping and pressure advance.
- Firmware: open — Prusa Buddy firmware (a Marlin fork), developed in the open.
- Mainboard: Prusa Buddy, STM32 — documented and community-friendly.
- Klipper: runs open Prusa Buddy firmware stock; community Klipper ports for Buddy-based machines exist, with the usual caveats.
- Slicer: PrusaSlicer (open-source); compatible with the wider open-slicer family such as OrcaSlicer.
- Ecosystem: open hardware, repairable with published guides and granular spares; no cloud lock-in (optional Prusa Connect for remote monitoring).
- AI tooling: minimal — sensor-based reliability and auto-calibration rather than an AI inspection camera or lidar.
- Product page: prusa3d.com.