FLSUN V400 3D Printer, 600mm/s Delta 3D Printer, Klipper Firmware, Φ260x330mm Review (2026)

A delta printer built around raw speed

The FLSUN V400 is a tower-style delta printer with three carbon fiber arms riding on belt-driven rails, a layout that trades the square, boxy footprint of Cartesian printers for a tall, narrow one better suited to vases, figurines, and other rotationally shaped or vertically tall prints. Independent reviews position it as a printer for makers who specifically want speed, noting FLSUN increased its rated top speed from 400mm/s to 600mm/s through a firmware update, which is unusually fast even among current-generation high-speed printers. It fits buyers already comfortable with delta kinematics or willing to learn, rather than someone wanting the simplest possible first printer.

Klipper firmware and the real build volume

The V400 ships with Klipper firmware pre-installed, and independent reviews describe it as the first delta printer to include Klipper out of the box, controlled through a 7-inch touchscreen running KlipperScreen. Multiple independent sources, including a retailer specification page and a major hardware outlet's review, list the build volume as a 300mm diameter by 410mm tall cylinder, notably larger than the 260x330mm figure that appears in this product's own title. Our score is based on the product as listed; buyers should confirm current specifications with FLSUN or a retailer before purchase, since printer specs on this model have changed across firmware and hardware revisions.

Setting up and tuning a fast delta

Klipper brings input shaping and pressure advance tuning to the V400 out of the box, both of which matter more on a fast delta than on a slower Cartesian machine since vibration and ringing become visible at high speed without proper tuning. The printer includes a direct-drive extruder with a bi-metal heat break capable of printing up to 300 degrees Celsius, supporting PLA, ABS, PETG, TPU, PC, nylon, and wood-filled filaments according to spec listings. Owners should expect a setup process closer to a semi-professional machine than a plug-and-play consumer printer, including calibrating delta geometry and radius, which Klipper's tuning tools make easier than older delta firmware but which is still an extra step beyond unboxing a Cartesian printer.

How it compares with other delta printers here

This guide ranks the V400 first among delta 3D printers, ahead of older Anycubic Predator and Kossel-style machines and FLSUN's own earlier QQ-S-PRO and Q5 models. The gap comes down to speed and firmware: the V400's Klipper-native control and 600mm/s rating outpace the stock firmware and lower speed ceilings on those older deltas. Compared with the round build volume every delta shares, the V400's height advantage over its rivals is one of its clearest selling points for tall prints, though its circular bed remains narrower at the base than a similarly priced square-bed Cartesian printer.

Verdict: fast and capable, but confirm the specs

The FLSUN V400 is a genuinely fast, Klipper-native delta printer well suited to makers who want speed and are willing to tune a delta rig to get it. Independent reviews back its 300mm by 410mm build volume, which is larger than the figure in this listing's own title, so shoppers should verify current dimensions before buying. It is not the printer for someone who wants square-bed simplicity or a fully hands-off setup experience. For makers who already run Klipper on other machines and want the fastest delta currently on the market, the V400 stands out as the clear choice within this guide's delta lineup, ahead of older Anycubic and earlier FLSUN designs.

Frequently asked questions