Specifications
| Brand | FLSUN |
|---|---|
| Build Volume | 500 x 500 x 480 mm |
| Max Print Speed | 600 mm/s |
| Number Of Extruders | 2 |
| Supported Materials | PLA, PETG, TPU |
Pros
- Sharp layers, accurate dimensions
- Fast printing speed
- Large build capacity
Cons
- Firmware update friction
- Klipper update failures
The Verdict
The FLSUN V400 targets jumbo prints with a 500 x 500 x 480 mm build volume, letting you run large parts in one go. It prints fast with sharp, accurate layers, but firmware and Klipper updates can fail, turning software maintenance into the main risk. With the right patience, it delivers clean large-format results for regular jobs.
Who it's for: Buyers who want big single-piece prints and are willing to manage firmware updates. This is a solid fit if you enjoy dialing in settings and can troubleshoot when Klipper or firmware changes do not go smoothly.
Who should skip it: People who hate tinkering or rely on effortless, error-free updates. If you want a printer that stays stable after each software change, the V400’s Klipper update failures may cost too much time.
In-Depth Review
Print Quality
With a score of 8.0, the FLSUN V400 lands in the “Sharp layers, accurate dimensions” tier. Users tend to report crisp layer lines and parts that measure close to the target model size. That matters most on large prints, where small calibration errors can compound across longer spans.
The V400 is also designed for speed. Its max rated print speed reaches 600 mm/s. At that pace, you usually see more ringing and stringing on fast kinematics. The reason this printer keeps its print-quality reputation is that the motion system and profiles seem to hold detail rather than smear it. You still need to inspect bridging and small text, but the baseline results are usually clean enough for functional work.
The other quality driver is scale. The build volume is listed as 500 x 500 x 480 mm, which gives it room for big shapes without forcing you into partial prints. When parts come out near spec on a jumbo frame, you spend less time on dimensional cleanup.
Reliability
With a score of 7.6, reliability is “Stays calibrated, rarely fails” in the middle of the pack. The V400 is meant for big jobs, so you cannot afford frequent babysitting. The good news is that it uses a dual gear direct-drive setup. Listings describe the extruder as dual, and the number of extruders is listed as 2. Dual direct-drive helps keep extrusion consistent when you push speed and run long layers.
Still, reliability is not just hardware. It is also firmware state. The main reported pain point is firmware updating. The buying guide calls out “Klipper update failures,” and also warns about “Firmware update friction.” That matters for reliability because even a well-calibrated machine can behave differently after an update. If you do long prints, you want stable firmware before you commit hours.
Material support is another practical piece. The V400 Max is listed for PLA, PETG, and TPU. In real use, that gives you options for stiff prototypes and tougher parts. But it also means you should expect different tuning demands per filament type, which can feel like reliability work when you switch materials frequently.
Ease
With a score of 8.0, ease fits the “Simple leveling, smooth workflow” tier. You are not starting from a tiny machine, and that can scare some first-time buyers. Yet the V400 is built around an approach that targets usability for everyday printing, not only for expert tweaking.
The workflow gets easier when the hardware matches the job. The build volume is large at 500 x 500 x 480 mm. That reduces the need to slice oversized models into multiple sections. Fewer parts mean fewer print jobs and fewer opportunities for bed adhesion problems on repeated attempts.
Also, multi-extruder setups can streamline color or material separation. The listings point to 2 extruders, and the purchasing guide highlights dual extruder capability. The flip side is that more paths can mean more ways to run into firmware and tuning issues if you update often. The ease story is strong for day-to-day printing, but it gets less friendly the moment you treat firmware like a frequent hobby.
Features
With a score of 8.2, the V400 is in “Smart convenience features, helpful extras.” The two big practical features are speed and scale. The max print speed is rated at 600 mm/s. The build area is 500 x 500 x 480 mm. Together, they support large models without forcing very slow print settings to stay safe.
It also supports two extrusion channels. The number of extruders is listed as 2. That enables multi-color and multi-material prints within the same job. For users who make mixed prototypes, that can reduce workflow overhead even if you do not plan to run complex toolpaths every day.
Material compatibility is another concrete strength. Supported materials are listed as PLA, PETG, and TPU. That is a useful spread for everyday filament printing and flexible part needs. One more detail that shapes real outcomes is the printer’s compatibility strategy: the speed number is high, but you still need to stay within the listed material set for best results.
Value
With a score of 7.6, value lands in “Average value, extra tuning needed.” The V400’s value case is mainly about output per print cycle. Large build capacity at 500 x 500 x 480 mm plus a max speed rating of 600 mm/s means fewer reruns for big parts if your setup is stable.
But your experience may hinge on software upkeep. The buying guide flags “Firmware update friction” and “Klipper update failures.” Those are not small concerns. If updates interrupt your configuration, you lose time and risk print failures during critical jobs. In a value equation, that is a hidden cost in effort.
The supported material list also impacts ongoing tuning workload. PLA, PETG, and TPU are covered, but each requires its own temperature and behavior tweaks. If you switch between materials often, you will likely spend more time dialing settings than you would on a more limited machine. The printer can deliver strong results, but you should expect some tuning work to stay consistent.
Frequently Asked Questions
What is the build volume on the FLSUN V400?
The FLSUN V400 has a build volume of 500 x 500 x 480 mm. That size works well for large cosplay parts, full-size prototypes, and bigger functional enclosures. If you print very tall items, keep an eye on stability for your model geometry.
How fast can the FLSUN V400 print?
The maximum print speed listed for this model is 600 mm/s. Real-world speeds often depend on your slicer settings, part cooling, and filament type. For best surface quality, you may need to lower speed on fine details.
Does the FLSUN V400 support PLA, PETG, and TPU?
Yes, it supports PLA, PETG, and TPU. The best results depend on correct temperature and cooling tuning for each material. TPU in particular usually needs slower moves and careful retraction settings to reduce stringing.
Is the dual extruder setup good for multi material printing on the V400?
The printer includes 2 extruders, which helps if you want multi material prints or dual color output. Your success will depend on whether you use compatible filament types together and how well your model avoids oozing and purge issues. Expect some dialing-in during the first few prints.
How hard is the firmware updating process on the FLSUN V400?
Firmware updates can be frustrating, and that is one of the most common complaints. Some users report trouble when updating, so plan updates when you can troubleshoot. If something fails, you may need to reflash or revert before printing again.
What should I do if Klipper updates fail on the FLSUN V400?
If a Klipper update fails, stop and avoid repeated partial retries. Recheck your update steps and power stability, then follow a known working recovery method rather than guessing. This is a practical limitation, so keep a backup of your last working configuration if possible.
Final Verdict
The FLSUN V400 earns a 7.9 out of 10 as a big build volume workhorse. It delivers sharp layers and accurate dimensions, and the speed helps you finish large projects quickly. Still, firmware updates can be a hassle, and Klipper updates have caused failures. I recommend it for experienced hobbyists who want a jumbo printer and can handle software tweaks.
Check how you plan to manage firmware and updates before you commit, especially if you print unattended. If you can stay on a stable setup, this is a sound pick.
