Flsun V400 3D Printer Speed King - 600mm/s High-Speed Delta

Our review of the Flsun V400 finds it aimed at makers and small shops who need very fast FDM prints without complex setup. The single biggest reason to buy is its preinstalled Klipper firmware and motion hardware that enable up to 600mm/s travel, which the manufacturer says can save as much as 85% of printing time versus mainstream designs. Out of the box it is ready for high-speed prototyping and iterative design cycles, while still supporting common filaments and a high-temperature nozzle for more demanding materials.

Key Features

• 600mm/s High-Speed Printing: Preinstalled Klipper firmware delivers ultra-fast motion so users can iterate designs far more quickly than with typical printers.
• Ultralight Short-range Extruder: The light extruder with 70N extrusion force is built for consistent filament feed at speed and works well with flexible and rigid materials.
• 300C High-Temperature Nozzle: A bi-metal throat and 300C capable nozzle let the V400 handle higher-temp filaments when properly dried.
• 11.8in x 16in Build Volume: A tall delta build area provides room for taller prototypes and multi-part assemblies without changing the machine.
• 7in Wide-angle IPS Screen: A large, responsive touchscreen with an optimized KlipperScreen interface simplifies day-to-day control and configuration.
• Auto-level and Filament Detection: Convenience features like automatic bed leveling and filament sensor reduce failed prints and setup time.

Who It's For

The Flsun V400 is best for hobbyists, designers, and small workshop owners who prioritize print speed and want a machine that is essentially ready to run with Klipper already installed. Its high-temperature capability and wide filament support also make it appealing to users who plan to experiment with PETG, ABS, nylon, or TPU.

Less suited users include absolute beginners who prefer the simplest, slow-and-safe learning curve or those who need ultra-fine, low-speed detail work as their primary goal; very small desktop spaces may also feel the footprint of a delta printer with an 11.8in by 16in envelope.

Pros & Cons

Pros

• Exceptional print speed thanks to preinstalled Klipper and a motion system rated for 600mm/s.
• Strong extrusion performance from an ultralight short-range extruder suitable for flexible and rigid filaments.
• High-temperature bi-metal throat and 300C nozzle expand material options to more technical filaments.
• Large, clear 7in IPS touchscreen improves usability and on-device control.

Cons

• High-speed operation may require tuning and experience to get the best dimensional accuracy at top speeds.
• Delta kinematics and the taller build area may take some getting used to for users accustomed to Cartesian printers.

Specifications

Model	Flsun V400
Printing Size	11.8in x 16in (highest point)
Nozzle Temperature	300C
Nozzle Diameter	0.4mm
Layer Height	0.05-0.3mm
Filament Support	PLA/PLA+/ABS/PETG/WOOD/TPU/PC/NYLON (need dried)
Control	7in IPS touchscreen, WIFI/USB, preinstalled Klipper

Our Verdict

The Flsun V400 is a strong choice for users who need rapid prototyping and a broad material range; its preinstalled Klipper firmware, high-temperature nozzle, and capable extruder deliver a compelling balance of speed and versatility. It represents good value for makers ready to tune prints for high-speed performance and who need taller print capacity.

Frequently Asked Questions

Does the V400 come ready to use?
The printer ships with Klipper preinstalled and supports WIFI/USB transfer, so setup focuses on assembly and filament preparation rather than firmware configuration.

What materials can it print?
It supports PLA, PLA+, ABS, PETG, TPU, PC, wood-fill and nylon (filaments such as nylon should be dried before use) and can reach nozzle temps up to 300C.

How large is the build volume?
The effective build area is approximately 11.8in in diameter with a maximum height to 16in at the highest point, suitable for tall parts and multi-piece projects.