Air-gapped large-format 3D printing for secure production environments

The Prusa CORE One L Critical Infrastructure Edition is a large-format enclosed 3D printer built for advanced manufacturing, aerospace, defence, and critical infrastructure workflows where network-connected hardware creates unacceptable risk. It combines the full printing performance of the standard CORE One L with hardware-enforced offline security, allowing proprietary or classified CAD data to stay in a 100% offline environment.

The platform delivers a 300 × 300 × 330 mm build volume, a state-of-the-art AC convection heatbed, and the same high-precision, high-reliability printing behaviour expected from the CORE One L.

Security is implemented at the hardware level rather than by software restriction. The custom-manufactured mainboard has all Wi‑Fi connectors and related circuitry physically removed, the printer ships with no camera, and the workflow supports a certified, encrypted USB drive together with letters of volatility for stringent security protocols.

True air-gapped security by hardware design

Hardware-level wireless removal

This edition uses a custom mainboard with all Wi‑Fi connectors and related wireless circuitry physically removed, not merely disabled. That approach creates a verifiable air-gapped configuration and removes the attack vector associated with network-dependent printers.

The result is full printer functionality in a completely offline deployment. For organisations handling sensitive intellectual property or classified design files, the security posture is built into the hardware itself rather than left to policy alone.

Secure offline workflow for classified data handling

Designed for controlled file transfer

The bundle is built around offline use. File handling can be managed with an optional certified, encrypted USB drive that is compatible with the platform, supporting secure transfer procedures inside controlled environments.

The machine ships with no camera, which removes the possibility of optical data capture from the printer itself. Letters of volatility are also provided to support strict internal or external security requirements.

Large-format printing for fixtures, spares, and full-size prototypes

300 × 300 × 330 mm build capacity

The CORE One L Critical Infrastructure Edition retains the full large-format capability of the standard machine. Its 300 × 300 × 330 mm build volume supports large functional parts, production fixtures, rapid-response spare parts, and full-size prototypes printed as single pieces.

Printing larger parts in one job reduces assembly steps and can improve fit, strength, and turnaround time. That makes the platform practical for end-use components and rapid iteration in secure industrial workflows.

Dimensional accuracy for industrial fit and function

What you design is what you get

The printer is engineered to deliver strong dimensional fidelity for applications where fit matters. A rock-solid exoskeleton frame and precision kinematics support the machine's stated goal of producing parts that match the original design intent.

Prusa cites CT scans as proof of the machine’s outstanding dimensional accuracy. For jigs, fixtures, mating parts, and end-use components, that accuracy helps ensure printed parts fit together as designed.

High-speed printing tuned for structural integrity

Fast output without brittle parts

The motion system combines robust CoreXY kinematics, a factory-tuned Input Shaper, and a high-flow nozzle to deliver high-speed performance. The machine is not presented as a speed-record printer; instead, the print profiles are internally tuned to balance throughput with part quality.

That tuning prioritises structural integrity, durability, and strong layer adhesion, even at higher print speeds. The intended outcome is functional parts that remain solid rather than brittle parts that crumble.

Easier flexible filament handling for engineering materials

Dedicated physical switch for flexible filament loading

Flexible filament printing is simplified through a dedicated physical switch. Activating the switch bypasses the primary filament sensor and opens a wider, less restrictive path that makes advanced flexible filaments easier to load.

A second sensor in the print head continues to provide runout detection. This arrangement supports reliable operation while reducing the loading difficulty commonly associated with softer materials.

AC convection heatbed for advanced material reliability

Uniform heat and chamber warming

The AC heatbed is precision-milled from a thick block of aluminum to provide even edge-to-edge heat distribution. Uniform heating reduces cold corners and helps prevent the warping problems that often affect large parts and engineering polymers.

Two fans mounted beneath the heatbed create a convection effect that quickly brings the chamber to a stable 60°C. This thermal environment is central to reliable printing in materials such as PC, ASA, and PA (nylons), helping reduce warping and cracking.

Redundant electrical protection for the AC heatbed system

Multi-layered hardware safety architecture

The AC heatbed is backed by a multi-layered safety system. The printer actively monitors for fault currents in a manner similar to a residential RCD and cuts power immediately if a leak is detected.

That protection is reinforced by redundant switching using both a relay and a TRIAC, providing a hardware fail-safe if one component stops functioning correctly. A robust shielded cable further supports the AC heatbed system.

Factory-prepared deployment for fast installation

Unpack, plug in, and print

The CORE One L arrives fully assembled and pre-calibrated from the factory. There are no complex self-tests or setup procedures required before use.

That shortens deployment time and makes the machine easier to introduce into a production environment. New operators and established teams can bring the printer into service in minutes rather than spending time on extensive setup.

Autonomous operation for long print jobs

Start-and-forget workflow support

This printer is engineered to manage critical systems automatically, including the print environment inside the chamber. The design supports reliable long-duration printing with minimal operator intervention.

Combined with the robust CoreXY platform and the machine’s focus on reliability, that autonomy supports overnight and unattended print jobs where consistent output and reduced downtime are priorities.

Designed for 24/7 industrial use

Low downtime and serviceable construction

The machine is intended for continuous production. Prusa states that its design draws on experience operating a 600-printer farm, with an emphasis on reducing downtime in real production settings.

The robust exoskeleton, simple maintenance procedures, and guaranteed spare parts availability all support long-term use in industrial or large-scale printing operations.

Higher batch throughput with a larger print plate

More parts per run

A larger build area improves productivity for both large parts and batch production. The print plate is 63% larger than the CORE One’s, allowing more objects to be placed in a single print job.

For print farms, spare-parts production, and fixture manufacturing, that means fewer operator interventions to harvest parts and reset the machine. The result is better autonomous productivity and less downtime between batches.

Transparent manufacturing and controlled supply chain

Produced in the EU and USA

Prusa states that it maintains full control over manufacturing and supply chain operations. Critical electronics, including the custom mainboard used in this edition, are manufactured on Prusa’s own PCB production line in Prague, Czech Republic, EU.

Final assembly of the CORE One L is carried out in Prague and in Delaware, USA. This structure is presented as a transparent and secure production pipeline for organisations that evaluate hardware provenance and manufacturing control.

ISO-audited manufacturing standards

Quality, environmental, and safety certification

Prusa’s manufacturing systems are certified to ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018. These certifications cover quality management, environmental management, and occupational health and safety.

According to Prusa, this printer is the first to be released after those ISO certifications were received. The certifications provide externally audited evidence of quality control processes, environmental responsibility, and team safety standards.

Open material and software choice

No walled garden or vendor lock-in

The CORE One L Critical Infrastructure Edition is presented as a fully owned tool rather than a restricted platform. Operators are not limited to proprietary materials, approved suppliers, or a closed software ecosystem.

You can use material from any supplier and choose any slicer software that fits your internal process. This open approach supports procurement flexibility, process control, and long-term independence from vendor lock-in.

Included training for operator onboarding

Comprehensive Prusa Academy course

Every CORE One L includes a full Prusa Academy online course. The course covers machine operation, printing workflows, and maintenance tasks.

For organisations onboarding new employees or rotating operators, the included training helps reduce internal training overhead and gives teams a consistent reference for day-to-day use.

Serviceable steel-frame design for long-term ownership

Built for longevity and maintenance access

The printer uses a robust all-steel exoskeleton that improves rigidity and contributes directly to print quality. The structure is designed for stability in demanding, long-duration operation.

Maintenance is also a core part of the design. No parts are glued together, the machine can be fully disassembled with standard tools, and spare parts availability is guaranteed to support a long operational life in critical environments.

Built on the CORE One platform

Larger format based on an award-recognised machine

The CORE One L is the larger sibling of the Prusa CORE One platform. Prusa notes that the original CORE One was recognised by All3DP as the “Best Enclosed 3D Printer of 2025” and described by TechRadar as “by far the most advanced and functional printer of this type”.

This larger model carries forward the same emphasis on robust design, precision, and reliability while expanding the platform for larger-format industrial applications.

Optional hardware ecosystem for specialised applications

Filtration, nozzles, and print surface options

The printer is fully usable as supplied, but optional accessories are available for more specialised workflows. These include an Advanced Filtration System with HEPA filtration for materials that produce particles.

Additional options include specialised nozzles for different applications and extra removable PEI spring steel print sheets. These accessories allow the platform to be adapted to varied materials, production goals, and maintenance preferences.

Use cases for secure offline manufacturing

• Critical infrastructure maintenance: Produce rapid-response spare parts and custom tooling without moving design files onto networked equipment.
• Aerospace and defence prototyping: Print large, precise prototypes, fixtures, and end-use components while keeping sensitive CAD data in an air-gapped workflow.
• Industrial production support: Run overnight batches of jigs, fixtures, and functional parts with a 63% larger print plate for improved throughput.
• Engineering materials development: Print PC, ASA, PA, and flexible materials with chamber heating, a convection-assisted heatbed, and a dedicated flexible filament path.
• Long-term facility deployment: Integrate a fully assembled, serviceable 3D printer into 24/7 production environments that require spare parts support, simple maintenance, and documented manufacturing standards.