QIDI Max4 – industrial 3D printer with a volume of 390×390×340 mm

QIDI Max4 Combo 3D printer – industrial volume and multi-material printing

QIDI Plus4 Combo is a professional "all-in-one" solution for large, complex, and colorful 3D projects. The printer features a 305×305×280 mm build volume, CoreXY kinematics, and reinforced belts, allowing precise printing up to 600 mm/s and acceleration of 20 000 mm/s². The bimetal nozzle heats up to 370 °C, while the active 65 °C chamber and heated bed up to 120 °C provide stability for technical materials like ABS, ASA, PC, PA, and composites. Automatic leveling and calibration of the Z-axis ensure a perfect first layer, and the machine is ready to print in just 10 minutes after unpacking.

QIDI Box transforms Plus4 into a multicolored platform: the system accepts up to 4 spools, supports connection of up to 16 materials by connecting additional modules, and uses hardened dual gear wheels for reliable feeding even of carbon and fiberglass filaments The built-in 65 °C drying function keeps the filaments dry, while the NFC chip recognizes the material and loads the correct profiles. QIDI Box automatically changes the rollers when depleted, monitors for tangling and clogging, thus ensuring continuous printing.

Printer control is possible via Wi‑Fi, Ethernet, or USB and can be performed through a mobile app or computer with options for local or cloud access. A 1080p camera with time-lapse provides remote monitoring of the process. QIDI Studio – new slicing software – is optimized for multi-color systems, and the printer also supports Orca, Cura, and PrusaSlicer. The package includes Cool Plate, tungsten bi-metal nozzle 0.2 mm, and filament spool, making the set ready to use and suitable for engineers, designers, and small productions

Printing technology and quality

QIDI Max4 Combo works on the technology of Fused Deposition Modeling (FDM) – melting and laying down filament layer by layer. The CoreXY architecture with 1.5GT belts and FOC closed-loop stepper motors in the X/Y axes ensures stable movements, minimal vibrations, and clean contours even during high-speed printing. The Z axis uses two screws with a 2 mm pitch and an anti-backlash nut, which reduces "ripple" effects and provides very even layers for high models.

The print head is equipped with a bi-metal, hardened 0.4 mm nozzle (options 0.2/0.6/0.8 mm) and a ceramic heating module capable of reaching 370°C. Thus, Max4 can work not only with standard filaments like PLA and PETG but also with engineering materials – ABS, ASA, PA/nylon, PC, as well as various carbon and glass composites (PLA-CF, PETG-CF, PA-CF, PA-GF, PPA-CF, PPS-CF, etc.), when using appropriate nozzles and profiles.

The bed consists of an aluminum plate with a silicone heater and a double-sided PEI platform, with a working temperature of up to 120°C. This ensures strong adhesion of the first layer and resistance to "warp" in large ABS/ASA/PC details. With standard settings, the layer thickness for quality surfaces is in the range of about 0.12–0.2 mm, which can be increased for rough prototypes and decreased for finer details (at the expense of print time).

The camera is actively heated to 65°C by an independent PTC heater and a feedback fan. This environmental control minimizes internal stresses in the material and cracking in high models, especially with engineering filaments. Together with the semi-enclosed print head and the additional Polar Cooler module, the system keeps the extrusion stable while also allowing PLA printing in a heated chamber without softening and clogging.

Performance and workflow

QIDI Max4 Combo is designed for high productivity. The maximum head movement speed is 800 mm/s, and the officially stated maximum kinematic performance of the hotend is 40 mm³/s. Thanks to the Klipper firmware, input shaping, and intelligent acceleration control, significantly higher speeds than classical FDM machines can be used without drastic loss of quality. With typical settings for high-speed PLA/ABS, it operates around 20–30 mm³/s, which is sufficient for fast prototypes and small series.

The workflow is maximally automated:

• Automatic leveling – the nozzle serves as a sensor (loadcell sensor), which eliminates offset errors between the sensor and the nozzle and ensures a precise first layer without manual adjustments.
• AI camera – a built-in camera up to 1080p monitors the print and can detect "spaghetti" and other anomalies, as well as record timelapse videos for documenting the process.
• Power interruption protection – a function for restoring the print after a power outage.
• Filament end and entanglement sensor – alerts when the filament runs out; when working with QIDI Box, entanglement detection is also activated and automatically switches to another spool.
• 3-in-1 filter – a combination of G3 pre-filter, HEPA H12, and activated carbon for capturing dust particles and volatile organic compounds in the enclosed chamber.

Management is done through a 5-inch touchscreen 800×480, mobile app, desktop software, and/or browser. The built-in 32 GB eMMC memory and USB 2.0 port allow printing from local files, and via 2.4/5 GHz Wi-Fi and Ethernet, the printer can also be managed through QIDI's cloud platform.

Compatibility and ecosystem

The official slicer is QIDI Studio – professional software with ready profiles for the printer and the full range of QIDI filaments, including engineering composites. Thanks to the Klipper firmware, Max4 is also compatible with popular third-party slicers like OrcaSlicer and PrusaSlicer, which facilitates integration into existing workflows.

The supported cutting formats include STL, OBJ, 3MF, STEP/STP, and the software is available for Windows, macOS, and Linux. This makes the printer convenient for mixed teams and educational organizations.

The heart of the Combo set is QIDI Box – a multi-material system that can feed up to 4 filaments from one box and can be "locked" to 4 units, for a total of up to 16 different materials/colors. QIDI Box has its own heated chamber up to 65°C for actively drying the filament, automatic switching of spools, and options for printing with soluble support materials. Thus, Max4 Combo is fully ready for multi-color, multi-material, and even technically complex printing (e.g., solid detail + soluble supports).

Design, ergonomics, and safety

The body of the QIDI Max4 is built from a steel chassis with plastic and glass panels. The dimensions of the printer are 558×578×612 mm, and the net weight of Max4 Combo is about 46.5 kg, indicating a massive construction and good vibration stability. The glass front window provides good visual access to the chamber, while the built-in lighting and RGB status indicator facilitate monitoring of the process.

Practical details such as smooth surfaces on the base for easy cleaning, handles at the bottom for moving, and well-organized cable management make the machine more convenient for daily use in an office, laboratory, or workshop. The chamber uses multiple sensors and a closed-loop temperature control, while fire-resistant materials in the construction of the chamber add an extra layer of passive protection.

The 3-in-1 filter module is highly recommended when working with ABS, ASA, PC, and composites, as it helps reduce the concentration of particles and odors in the room. Together with proper room ventilation and adherence to the guidelines in the official manuals, this provides a safe foundation for prolonged printing.

Professional usage scenarios

• Engineering prototypes and functional parts – the large volume of 390×390×340 mm allows for printing machine housings, industrial covers, assembly jigs, and fixtures from materials such as PA-CF, PA-GF, PC, and PPS-CF. The active chamber and high nozzle temperature help achieve strong, heat-resistant parts suitable for test assembly and real-world use (within the polymer's specifications).
• Cosplay, props, and decor – the Max4 can print full-size helmets, armor, and large props in one piece, without cutting into multiple segments. PLA and ABS parts benefit from the evenly heated bed and chamber, which reduces warping and the need for complex post-processing.
• Small series and custom production – with the QIDI Box, you can produce small series of parts with different color schemes, marking variations, or a six-digit traceability code, without manually changing spools. The automatic filament reloading allows for long prints in a 24/7 mode.
• Molds and fixtures for composite materials – the large chamber is particularly suitable for printing molds for vacuum forming, carbon, and fiberglass. The even temperature and stable geometry facilitate subsequent sanding and application of release agents.
• Training and R&D – in university and corporate laboratories, the Max4 serves as a "bridge" between desktop and industrial 3D printing. The ability to work with various materials and the open profiles in Klipper make it suitable for experiments with process parameters and new filaments.

Limitations and best practices

Despite its high capabilities, the QIDI Max4 Combo has some practical limitations and setup requirements:

• Warping and cracking in very large ABS/PC parts – a 65°C chamber significantly reduces this risk, but for extremely large or thick parts, it is advisable to use a brim/raft, special adhesives for PEI, and to avoid sudden temperature changes during cooling.
• PLA in a heated chamber – at high temperatures, PLA can soften in the area of the feeding gears. Polar Cooler and the active cooling of the extruder minimize this problem, but it is good practice to limit the temperature in the chamber when using PLA and to use QIDI profiles for this material.
• Very soft TPU (under 85A) – a hardness of around 95A is officially recommended; for softer TPU, you should reduce speed and retractions, and sometimes accept a compromise in quality. It is advisable to follow specialized guides for TPU and test gradually.
• Filament humidity – nylon, PC, and composites are highly hygroscopic. Use the QIDI Box for drying during printing and store spools in dry boxes to avoid popping, bubbles, and poor adhesion between layers.
• Maintenance – periodically clean the PEI plate with isopropyl alcohol, check the condition of the belts and linear guides, and monitor the filter. Firmware and software updates from QIDI improve stability and add features, so it is good practice to apply them regularly.

Technical specifications