QIDI Max4 Combo Review: Large-Format, Multi-Material 3D Printing

The QIDI Max4 Combo is a substantial machine, featuring a 390×390×340mm build volume that accommodates large parts without requiring segmentation. Its construction includes closed-loop motors on the X/Y axes and a 2mm lead screw with an anti-backlash nut on the Z-axis, indicating a focus on stability and precision. Owners frequently describe the printer as robust and well-built, often requiring two people for safe relocation due to its considerable weight. The design integrates a heated chamber, crucial for working with high-temperature materials, though the Polar Cooler system requires a separate purchase. The full-surface silicone heated bed receives praise for its even temperature distribution and reliable first-layer adhesion.

Many owners report a straightforward setup process, with the printer often functioning effectively out of the box. Initial calibration is largely automated, simplifying the first-print experience. However, some users encountered initial hurdles, including Wi-Fi connectivity issues and firmware update problems that could lead to fault messages. The large touchscreen and optimized interface contribute to an intuitive operating experience. The QIDI Box, while enabling multi-color printing, can be noisy during filament changes and requires precise alignment of its filament buffer to prevent external feed jams. The toolhead sensor has also been noted as temperamental, sometimes requiring slight tilting of the machine to avoid false triggers.

The Max4 Combo consistently delivers excellent print quality, producing detailed and precise outputs. Users highlight its capability to handle rapid printing speeds (up to 800mm/s) without sacrificing surface finish or object integrity. The high-flow hotend with a hardened steel nozzle supports a broad spectrum of materials, including PLA, PETG, ASA, ABS-CF, PC, and PPS-CF. Owners confirm its suitability for demanding applications, such as aerial drone components, where engineering filaments are routinely used. Long-term use reports suggest reliable performance over hundreds of hours, with consistent outcomes across various print jobs and materials, reaffirming its workhorse capability for both complex prototypes and routine manufacturing.

The printer supports both its proprietary QidiStudio slicer and third-party options like Orca Slicer. While some users initially struggled with software-related issues, those who resolved them found the QidiStudio app effective, offering direct network printing and often cleaner results compared to alternative slicers. The integrated AI camera automatically detects certain printing failures, like spaghetti-like anomalies, pausing the print to conserve material. The QIDI Box expands functionality by enabling up to 16-color printing and multi-material capabilities, alongside intelligent filament management, including real-time monitoring and automatic pause on run-out. However, the multi-color printing process can generate high filament purge amounts, a common characteristic of such systems.

The QIDI Max4 Combo presents what many owners consider a strong value proposition, particularly for its large format, multi-material capabilities, and ability to handle engineering filaments effectively. Priced well north of $1000, it offers features commonly found in more expensive industrial machines. Reliability is a recurring theme, with many users reporting minimal issues, even after extensive operational hours. Customer support receives consistent praise for being responsive and knowledgeable, often assisting users in resolving setup or operational difficulties. While some initial teething issues are reported, the overall consensus points to a robust, high-performing printer that reliably produces quality results, making it a solid investment for its target audience.