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We recently took delivery of Flsun’s S1 3D printer and had to double-take at the sheer size of the box it came in. Amidst the trend of compact CoreXY boxes, it’s easy to forget that other 3D printer kinematics still exist, and, in the case of Deltas, the printers tend to be pretty tall.

At over a meter tall, the S1 eclipses almost everything else we have right now. Only the Elegoo OrangeStorm Giga tops it. It really is massive. And its feature list reads like an angry statement to all others. We’ll do all that, and more.

Who hurt you Flsun? Who hurt you so to cause you to go all brooding villain, throwing everything and the kitchen sink at a printer, standing (on paper) as king of the hill. Because that’s exactly what the Flsun S1 is; it’s Kylo Ren yelling “MORE!” and Leon: The Professional’s Stansfield’s unrepressed “EVERYONE!” all rolled into one.

Prusa XL for scale: the S1 is massive (Source: All3DP)

Between the printer’s product page and a feature list provided by the company, this is how much printer Flsun says it has crammed into the S1:

Max acceleration and speeds of 40,000 mm/s and 1,200 mm/s, respectively
110 mm³ volumetric flow
High-pressure CPAP part cooling fan
Dual cameras, laser, and Lidar print quality sensors
Camera-based “AI” debris and “spaghetti” detection system
Fully automatic bed leveling
Dual-zone bed heating
350°C hot end, 120°C heated bed
Hardened steel nozzle
Filament drying function
Humidity-monitoring filament bay
Filament consumption monitoring (weight-sensitive spool holder)
Heated print chamber to 50°C
Timelapse capture
OTA updating
Remote monitoring and printer management
Print progress indication lighting
Auto-shutdown and energy-saver controls
Front-facing power/stand-by button
Charcoal air filter
Filament break, jam, and blockage sensors
Auto-calibration and self-testing
Native time-lapse playback

Riffing on its size and lavish features set aside, our experience with the printer so far has mostly been positive. The last Flsun machine we tested, the V400, offered stunning print quality at high speeds, and the S1, a handful of test prints in, continues this trend. The onboard software is easy to navigate and offers plenty of options to you in the printing, with various levels of calibration and print-monitoring smarts possible.

At this early stage, though, it seems FLSun’s software needs some care and attention from the company before it’ll come close to the out-of-the-box experience we see with the likes of Bambu Lab and Creality. It may be based on PrusaSlicer (acknowledged in Flsun’s GitHub repo) but Flsun Slicer currently trips over at install, with temp files created in the process triggering malware warnings. Running it in a sandbox circumvents the fishy-looking install, but it’s only been a quick fix for us to do some testing. We expect (hope) Flsun irons this stuff out before general availability.

The machine itself seems as impressive as its feature set suggests. We’ll continue to put it through its paces for a more in-depth look soon. In the meantime, a word of warning for anyone interested in picking one up – it’s loud. The CPAP fan used to keep cooling on pace with the high speeds it prints at is so, so loud.

The FLSun S1 is available to preorder now, with a current presale discount slashing the price from the expected retail of $1,499 down to $1,299. We’ll continue putting it through its paces and report back soon with our thoughts.

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License: The text of "The Flsun S1 Is a Monster – First Print" by All3DP is licensed under a Creative Commons Attribution 4.0 International License.