QIDI Plus4 Combo is a professional all-in-one solution for large, complex, and colorful 3D projects. The printer has a 305×305×280 mm working volume, CoreXY kinematics, and reinforced belts, allowing for precise printing at 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 ensure stability with technical materials such as ABS, ASA, PC, PA, and composites. Automatic Z-axis levelling and calibration guarantee a perfect first layer, and the machine is ready to print in just 10 minutes after unpacking.
QIDI Box turns Plus4 into a multicolor platform: the system accepts up to 4 spools, supports up to 16 materials by connecting additional modules, and uses hardened double gears for stable feeding even of carbon and glass fiber 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 rolls when they run out, monitors tangling and clogging, and thus ensures continuous printing.
The printer can be controlled via Wi-Fi, Ethernet, or USB and can be operated via a mobile app or computer with local or cloud access options. A 1080p time-lapse camera provides remote monitoring of the process. QIDI Studio, a new slicing software, is optimized for multicolor systems, and the printer also supports Orca, Cura, and PrusaSlicer. The package includes a Cool Plate, a 0.2 mm tungsten bimetal nozzle, and a filament roll, making the kit ready to use and suitable for engineers, designers, and small manufacturers.
The QIDI Max4 Combo operates on Fused Deposition Modeling (FDM) technology – 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 at high-speed printing. The Z axis uses two 2 mm lead screws and an anti-backlash nut, which reduces “roll” effects and ensures very even layers in tall models.
The print head is equipped with a bimetallic, hardened 0.4 mm nozzle (options 0.2/0.6/0.8 mm) and a ceramic heating module capable of reaching 370°C. This allows the Max4 to work not only with standard filaments such as PLA and PETG, but also with engineering materials such as ABS, ASA, PA/nylon, PC, as well as a variety of 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 an operating temperature of up to 120°C. This ensures strong adhesion of the first layer and resistance to warping in large ABS/ASA/PC parts. With standard settings, the layer thickness for high-quality surfaces is in the range of 0.12–0.2 mm, which can be increased for rough prototypes and reduced for finer details (at the expense of printing time).
The camera is actively heated to 65°C by an independent PTC heater and feedback fan. This environmental control minimizes internal stresses in the material and cracking in tall models, especially with engineering filaments. Together with the semi-enclosed print head and the optional Polar Cooler module, the system keeps extrusion stable while also allowing PLA to be printed in a heated chamber without softening or clogging.
The 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 classic FDM machines can be used without a drastic loss of quality. With typical settings for high-speed PLA/ABS, the machine operates at around 20–30 mm³/s, which is sufficient for rapid prototyping and small series production.
The work process is automated as much as possible:
Control is via a 5-inch 800×480 touchscreen, mobile app, desktop software, and/or browser. The built-in 32 GB eMMC memory and USB 2.0 port allow printing from local files, while 2.4/5 GHz Wi-Fi and Ethernet enable printer management via the QIDI cloud platform.
The official slicer is QIDI Studio – professional software with ready-made 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 such as OrcaSlicer and PrusaSlicer, which facilitates integration into existing workflows.
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 kit is the QIDI Box – a multi-material system that can feed up to 4 filaments from a single box and “chain” up to 4 pieces, for a total of up to 16 different materials/colors. The QIDI Box has its own heated chamber up to 65°C for active filament drying, automatic spool switching, and options for printing with soluble support materials. This makes the Max4 Combo fully ready for multi-color, multi-material, and even technically complex printing (e.g., solid detail + soluble supports).
The body of the QIDI Max4 is constructed from a steel chassis with plastic and glass panels. The printer measures 558×578×612 mm, and the net weight of the Max4 Combo is approximately 46.5 kg, indicating a robust construction and good vibration stability. The glass front window provides good visual access to the camera, while the built-in lighting and RGB status indicator make it easy to monitor the process.
Practical details such as smooth surfaces on the base for easy cleaning, handles on the bottom for moving, and well-organized cable management make the machine more convenient for everyday use in an office, laboratory, or workshop. The chamber uses multiple sensors and closed-loop temperature control, and fire-resistant materials in the chamber construction 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 particle and odor concentration in the room. Together with proper room ventilation and following the instructions in the official manuals, this provides a safe basis for continuous printing.
Despite its high capabilities, the QIDI Max4 Combo has some practical limitations and configuration requirements:
