In the announcement of the Prusa CORE One, I wrote that ”it is easily scalable – allowing us to be incredibly nimble in future projects.” Today, I’m excited to show you what this meant. Meet the Prusa CORE One L.

This is our new large-format, enclosed CoreXY 3D printer, and it’s the larger sibling of the proven Prusa CORE One, essentially an expansion of the family. We know that one size doesn’t fit all. Some jobs are fine with a compact footprint, while others demand sheer scale. The CORE One L is for every engineer who got frustrated prototyping large parts in pieces, every prop maker who wants to print a helmet in one go, and pretty much every creator who wants to get the most out of advanced materials.

CORE One L hits the sweet spot for the ratio between large print volume and the printer’s footprint. No more spending hours cutting up your models in the slicer and gluing them together. And what took six separate prints before, you can now knock out in two. But the really cool part is how we did it. The CORE One L is only 10% larger compared to CORE One, but offers 200% print volume. And it still fits on your desk! It’s big on the inside, compact on the outside.

Also, for the first time ever, we’re adding a special version for critical infrastructure directly to our e-shop. The production is already in full swing, and we’ve sent the first units to reviewers. You can get your CORE One L right here.

And there are some surprises under the hood! Curious? Let’s take a look!

THE 6 BEST THINGS ABOUT THE CORE ONE L

Like always, I started with a short, concise article. And then I got into the technical details. And it kept snowballing from there. So, let me first give you the overview of the most important things before I start geeking out about the convection-style airflow. 🙂

1. Fits on a table, print volume ~30 liters / 1 cubic foot, runs on standard power.

The print volume is 300×300×330 mm – plenty of space for large, durable models in a single piece. The chamber goes to 60°C, creating the perfect environment for many advanced materials.

2. AC convection heatbed with <2°C variance across 99% of the surface

Nothing can beat a solid chunk of aluminum. Plus, we have dual-loop heating, beautifully uniform heat distribution with a variance of less than 2% across 99% of its surface, killing warping and cold corners. Two fans on the heatbed’s underside (paired with two air deflectors) are designed to warm up the chamber quickly.

3. 60°C heated chamber with smart temperature management and exhaust port for HVAC or filtration

A true “start and forget” machine. The CORE One already did a lot to automate the chamber temperature, but this goes one step further with the automated top vent opening and closing. Plus, the new heat distribution system warms up the chamber much faster.

4. Quality high-speed printing with YOUR materials, not just ours

A genuine Bondtech 🇸🇪 CHT nozzle comes pre-mounted. It’s engineered for high flow with all filaments because speed means nothing if you can’t use the materials you’ve already tested and qualified for production. Special internal geometry melts filament faster through optimized heat transfer. A wear-resistant nozzle for abrasive materials is included with every printer.

5. Unpack and print! Precalibrated from the factory.

The CORE One L is available as an assembled printer only. It comes fully pre-calibrated from the factory, including Phase Stepping and Input Shaper (more on these later). When you unpack it, you simply select the preferred language and complete an optional connection wizard. It’s a complete package with a 1080p camera, two nozzles, a comprehensive Prusa Academy course, and more.

6. Security ready for critical infrastructure

Our printers were always focused on security – embedded platform, open-source firmware, removable radios and cameras, encrypted flash drive as an addon, and offline-first design. We feel that security matters now more than ever, so we’re bringing new security options.

Twice the Volume, Not Twice the Size

When we started this project, the goal was straightforward on paper: deliver a massive increase in print volume, BUT without a massive increase in the machine’s footprint. Anyone can make a machine bigger, but that just makes it heavy and clumsy. We wanted to avoid building a monster that needed its own room and a forklift to move. The problem is that scaling things up almost always means making them heavier. That was a compromise we weren’t willing to make. We kept the solid, laser-cut steel profiles from the CORE One’s exoskeleton – that was non-negotiable. With that idea locked in, we started a hunt for every single gram we could shave off elsewhere without sacrificing the sturdy and robust design.

The side panels are now lightweight aluminum (they lost their magnetic properties, but we added mounting holes for user modifications), the bottom section is completely redesigned, and more. All in all, CORE One L is only 10% larger than the CORE One AND 0,5 kg lighter. The large 300×300 heatbed fills the chamber perfectly, with no extra space to spare. The print volume is ~30 liters (1 cubic feet), and the printer is still built like a tank to survive the chaos of a busy workshop, running 24/7 without breaking a sweat.

Left: CORE One / Center: New CORE One L / Right: MK4S

The Heat is On: Our New Convection AC Heatbed

The single biggest innovation in the CORE One L, and the key to reliable large-format printing, is its brand-new heatbed. We went back to the drawing board to solve the number one problem that plagues large prints: uneven heating and cold corners, which lead to warping and failed prints.

We knew that for perfect, uniform heat, there could be no shortcuts and no spared expense. When it comes to thermal stability, nothing can beat a proper, thick block of aluminum. So that’s exactly what we used. The heatbed is made from cast metal, precision-milled to be perfectly flat, with an integrated dual-loop heating element. This design delivers incredibly uniform heat across the entire surface. The temperature variance is less than 2 °C across 99% of the print area.

What does this mean for you? No more cold areas. No more worrying about placing your model in the right spot. You can truly print from edge to edge with confidence that your model will stay put, without any lifting or warping. And even though this heatbed is much bigger compared to CORE One, it heats up 25% faster.

Effortless Printing of Advanced Materials

But we didn’t stop there. For the first time on a Prusa printer, we’re also using the underside of the heatbed to actively heat the chamber. We’ve mounted a pair of fans there to create a forced convection effect; they suck air from the chamber and blast it across the massive, hot surface of the heatbed’s underside. Two specially designed air deflectors then redirect this stream of hot air, spreading it evenly throughout the chamber. It’s a surprisingly efficient and fast way to heat up the entire print volume – all the way up to 60 °C. The chamber also has an exhaust with the possibility of mounting a filtration or HVAC system.

This stable, heated environment is the key to printing high-performance materials like ABS, ASA, Nylon, and Polycarbonate without issues. It ensures perfect layer adhesion and prevents parts from cracking. We expect that advanced materials will be the most popular with the CORE One L, so this is why we include both a genuine Bodtech high-flow nozzle and a wear-resistant nozzle in the box.

You can:

• Print parts that will be exposed to UV rays and harsh sunlight from ABS and ASA
• Quickly iterate jigs and fixtures from PETG
• Print large, flexible parts for extreme wear resistance from TPU

Plus, we offer** chemically-resistant and ESD-safe materials, radiation-shielding polymers,** and so much more. I think brilliant PLA support goes without saying – and you can still print it with the printer’s door neatly closed. 🙂

We also modified the filament insertion point for easier loading of flexible materials – flip a physical switch to create a low-resistance path for flexible filaments.

The CORE One already had active chamber temperature control, which basically created the best possible environment for the selected print job. There was one downside, though. Due to the printer’s compact dimensions, we were unable to implement automatic vent grille operation. With the CORE One L, we made it possible. When you select a low-temperature material (e.g., PLA or PETG), the printer will automatically open the top vent using a lever on the extruder. For high-temperature materials, the vent is automatically closed.

With the CORE One L, you really don’t have to worry about anything. Just load the material and start the print. If you plan to print materials that produce an increased number of particles, we also offer an optional HEPA filtration system.

Full Power, No 110V Compromise

This heatbed is a clever bit of engineering we’re really proud of, so let me dive a little deeper. One of the key aspects for a manufacturer is to make as few variants of a component as possible – easier production & distribution, easier QA, and also a lot fewer headaches for the user.

One thing I really want to point out is the heatbed’s solution for handling different mains voltages around the world. Usually, manufacturers make different, often weaker, components for 110V regions. This is not the case here.

Our power management is now significantly more intelligent. Instead of a simple binary check, it provides comprehensive power monitoring by analyzing the full voltage waveform in real-time. This allows the printer to automatically distinguish between 110V and 230V grids and intelligently configure the heatbed for consistent performance in any part of the world by hooking up the heating either in serial or parallel. This detailed analysis also enables the firmware to filter out minor grid fluctuations, virtually eliminating false power-loss triggers and boosting print reliability.

We’ve implemented** a multi-layered AC safety architecture,** central to the printer’s design. The system actively monitors for fault currents – similar to a residential RCD – and will immediately cut power if a leak is detected. This is backed by a redundant switching design using both a relay and a TRIAC. If one switching component fails, the other provides a hardware fail-safe to disconnect the circuit. This approach is physically reinforced by a shielded cable for the AC heatbed, providing an additional layer of robust protection.

So, that’s all about the heatbed (at least for now). We need to move on. No more uneven spots, no more cold corners – best possible print quality. Which brings me to…

Precise, Production-Ready Parts

Yes, an ever-present topic. Every printer manufacturer talks about print quality. So, I want to be very specific about what we have done to make the next major step towards perfecting our 3D prints.

We use everything that works great on the CORE One – things that have earned the printer numerous awards for print quality. Thanks to its rigid CoreXY kinematics and an extruder with 360° cooling, the CORE One L can also handle ridiculous 75° overhangs. This drastically reduces the need for supports, saving you time, material, and cleanup. And when you do need them, our organic supports in PrusaSlicer are the next best thing to soluble supports – they’re efficient, reliable, and incredibly easy to remove, leaving barely a trace.

Lately, we’ve been on a mission to perfect print quality. We published our deep dives into fighting VFAs (Vertical Fine Artifacts), and all of that research has been poured into the CORE One L. The new PrusaSlicer feature called “Consistent Surfaces” delivers a production-quality finish right off the print bed. By optimizing path planning and speeds, we’ve nerfed VFAs and** eliminated the ugly glossy and matte stripes** that can ruin a print’s appearance. Your objects will look so good, you can often use them as final products, skipping the expensive and slow process of injection molding.

Left – Black PETG with Consistent Surfaces OFF / Right – Black PETG with Consistent Surfaces ON. Watch stand by @Bukken

Of course, looks are nothing without precision. Anyone who has ever designed parts that need to fit together knows that dimensional accuracy is everything. We’ve proven with CT scans that our machines deliver on this promise – your models will turn out just the way you designed them. As we like to say: What You Design is What You Get. 🙂

Left: CORE One L / Right: CoreXY Competitor – the more the color deviates from green, the greater the inaccuracy

And you don’t have to sacrifice speed for this quality. Thanks to its robust construction, two specialized nozzles in the package, factory-tuned Input Shaper, and internally-developed print profiles, the CORE One L is just as fast as the CORE One. Plus, the firmware contains our new belt tuning method using a stroboscope effect. Of course, the printer comes pre-calibrated from the factory, but if you perhaps need to tighten the belts after thousands and thousands of hours of printing, you can find the perfect sweet spot in two minutes.

For Those Who Mean Business

Every part of the Prusa CORE One L was designed with one philosophy: make printing completely effortless. This makes it the perfect tool to accelerate production, whether you’re a solo engineer, run a full-scale print farm, or you’re just looking for a way to print large, tough, and durable models in one piece.

The zero-setup experience is a huge advantage in a professional setting. Unpack, plug in, start. There’s no complex calibration or long training for new employees. You can have a new machine working for you in minutes. You simply pick a language for the UI and decide whether you want to connect the printer to your network. The path from professional CAD software like SolidWorks, Autodesk Fusion, or even directly from STEP files, to a physical part has never been shorter. And with Prusa Connect, you can manage everything remotely – monitor prints, schedule jobs, and even track running costs and ROI.

We’re also including a full, comprehensive Prusa Academy online course with every CORE One L – it will give you the perfect overview of running, printing and maintenance of your machine. Perfect for getting to know your printer better, but also for the education sector or onboarding of new employees.

More printing, less downtime

Since we operate a massive 600+ machine print farm in-house,** all our machines are designed to run 24/7.** Our print farm still has its place and purpose, although we’re also producing more and more parts using injection molding – especially where we don’t have to be so flexible. Nevertheless, our print farm has never been a bottleneck in our production.

The larger volume of the CORE One L doesn’t just let you print bigger parts; it changes the entire efficiency of your operation. A farm’s success isn’t just about reliability; it’s about autonomy – operator actions and downtime. Every time a print finishes, an operator has to harvest the parts and start the next job. And a large print area means fewer interventions. The data speaks for itself. Look at a shelf space of 500 cm horizontal by 300 cm vertical:

Calculation made using a simple PCCF bracket. Operator Action = 10 minutes for bed cooldown, harvesting, surface maintenance, nozzle inspection, and starting a new print job.

A 1080p camera with night vision is included in the package, and you’re free to choose whether to install it. You can use it to monitor your prints via Prusa Connect / Prusa App or to easily create timelapse videos.

Straightforward Maintenance

This brings me to another important point: we always designed our printers to be easy to maintain and straightforward to service. The open-frame printers like the MK4S are the best example, but we took extra care to bring the same level of user friendliness to the CORE One family.

The nozzle can be swapped in 30 seconds, or you can even replace the entire hotend (nozzle plus heater) in about a minute – remove the cover, undo the thumbscrews, remove two connectors. You don’t even need to preheat the nozzle. Plus, since we’re using the LoadCell technology, there is no need to recalibrate the printer after a nozzle swap.

As usual, nothing is welded or glued together. I often joke with my team that the printer should always be fixable with a hammer and a screwdriver – but it is just a manifestation of our goal to make a repairable machine. You can actually take the whole CORE One L apart with simple screwdrivers.

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We guarantee the availability of spare parts for at least five years. Last, but not least, we have our 24/7 tech support in seven languages staffed by experienced operators – no AI bots. You always talk to a person.

Our Ecosystem: Open, Secure, Optional

When you get one of our printers, you can choose to integrate it into our ecosystem – we have the complete set of tools and services to cover all your needs. Feature-packed PrusaSlicer (which also serves as the basis for many other slicers on the market), Connect for remote print management and monitoring, the officialApp for iOS/Android, Prusament, Academy courses (one is bundled with the CORE One L), and, of course, Printables with over one million models to choose from.

And if you haven’t tried** EasyPrint** yet, you’re missing out. It’s our new online slicer, which works anywhere – on your smartphone, tablet, or web browser. It’s incredibly powerful, easy to use, and above all: it’s a real slicer. You can adjust your models in real time, clone and rotate them. And then it takes just a couple of clicks (or taps) and the file is wirelessly transferred into your printer from anywhere in the world. It’s a true game changer.

Needless to say, all of this is optional. If you want, you can keep the printer completely offline, use other slicers, and get print files from anywhere. You have total control. We believe that you own the hardware you buy, not just a license to use it.

Security First

We take security very seriously. All connectivity on the CORE One L is 100% optional. You never have to connect it to the internet, not even for the first setup. If you want a completely offline machine, you can even unplug the Wi-Fi module, and it will work perfectly. And the firmware is open-source, so you can always inspect the source code in full.

But we understand that even this is not enough for certain situations. In fact, we already had a special air-gapped version of the XL on a “secret menu”.

The new machine has this version generally available from the start.

We’re introducing Prusa CORE One L: Critical Infrastructure Edition. This is a special bundle for enterprise, government, and defense sectors where data security is non-negotiable. This edition features a custom-manufactured mainboard without any Wi-Fi circuitry. We also offer an encrypted, certified USB drive, and we provide letters of volatility to meet strict security requirements.

For all our printers, we make our own electronics** on our own PCB production line right here in our factory.** We are also proud that the CORE One L is manufactured in both Prague, EU, and Delaware, USA, bringing production closer to our customers.

Finally, this is our first printer released since we received our ISO certifications for Quality Management (ISO 9001:2015), Environmental Management (ISO 14001:2015), and Occupational Health & Safety (ISO 45001:2018). They are audited proof of our commitment to quality, reducing our environmental footprint, and taking care of our team.

Better Spools & Open Print Tag standard

These things go hand in hand, and we have a special article and dedicated website just about them, so I’ll try to be brief here.

I think I speak for a lot of people here when I say that nobody really likes 2D printers – constantly running low on ink, and it seems like the cartridges contain more electronics and vendor-locked chips than actual ink. And everybody uses a different standard. Sure, we don’t need to like 2D printers… but sometimes, they are just unbearable. This is why we were extra careful when we started thinking about NFC tags inside Prusament spools. We didn’t want to take the same annoying vendor-locked path. Besides, NFC tags in spools are nothing new, so why bother? Because** there isn’t any viable and backed standard** that would work with all brands.

And we plan to change that.

From now on, every new Prusament spool comes with a fully rewritable NFC tag powered by the OpenPrintTag standard. It’s designed to work across brands and ecosystems, it’s fully open source, reusable, cheap, and works entirely offline. All essential data is stored directly on the tag. Your printer can recognize the spool instantly, with no dependence on cloud services. It is a standard that is truly and actually OPEN. And we get it: convincing other companies to take the plunge and be the first is always difficult. This is why we’re taking the first step as one of the largest filament manufacturers in the world – soon, thousands upon thousands of Prusament spools will be NFC-enabled. It’s a huge undertaking, but we believe we’ve grown enough to make a difference. And the list of interested companies and groups is pretty impressive already!

How does the CORE One L fit into all this? We’re soon going to introduce the optional Open Print Tag spoolholders for the MK4S, XL, CORE One, and CORE One L. With these, every time you put a spool on the spoolhoder, the printer will instantly recognize the material. And you’re completely free to take the tag, rewrite it and put it on another spool. Plus, we have the best tech on the market: 360° read/write and NFC performance so good that it works even on big 2kg spools. You can also scan the spools with your phone and see a detailed description on the web.

You can read more about it here and here.

The Road Ahead

We have a clear roadmap of expansions that will keep adding value for years. First, the CORE One L is fully ready for the MMU3, our fast and efficient solution for printing with up to five filaments at once. The MMU3 for the CORE One L will be available in early 2026.

A future firmware update will enable Print Sheet Recognition, using the printer’s camera to scan a QR code on the sheet to make sure you’re using the right one. I already talked about the Open Print Tag and special NFC-enabled spoolholder. And, of course, you can count on new firmware releases bringing new features and possibilities.

Also, since we’re talking about multi-material printing: more info about INDX for CORE One will be available during FormNext.

Your Next Project Starts Here

So that’s the Prusa CORE One L. It’s compact on the outside and huge on the inside. You get the next-generation heatbed with zero cold spots, an active convection heated chamber,** a 1080p camera,** and full support for the upcoming MMU3. I’m incredibly proud of what our team has accomplished, and I honestly can’t wait to see what you will create with it.

Needless to say, both the CORE One and the MK4S are here to stay because they still offer indisputable benefits in their own categories. In fact, with the recent firmware releases and all available accessories, they are better than ever. Plus, you can get them with plenty of goodies during this year’s Black Friday event, and the MK4S is the cheapest it’s ever been.

Production of the CORE One L is already underway, and the eshop page is live – the first units are scheduled for shipping in the upcoming days.

Happy printing!