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FLSUN S1 specifications and in-depth review

FLSUN S1

Manufacturer: FLSUN

The FLSUN S1 is an FDM 3D printer built around a large build envelope and a notably high rated print speed, making it a machine oriented toward users who prioritize throughput and build size. It features a touchscreen interface, automatic bed leveling, and power loss recovery, and it supports remote control via smartphone over Wi-Fi. The printer comes with a 2-year warranty and requires assembly before use.

The S1 uses 1.75 mm filament through a single 0.4 mm nozzle and supports PLA, ABS, PET, PETG, and PVA materials, covering a practical range of common filament types. Its maximum print speed reaches 1200 mm/s, and the build area extends to 320 x 320 x 430 mm with a minimum layer thickness of 100 µm. The heated build platform supports temperature-sensitive materials, and the printer accepts STL, OBJ, AMF, and 3MF file formats. It draws up to 1300W during operation, connects via Wi-Fi or a single USB port, and has no external memory slot or wired Ethernet port.

Pros
  • A rated print speed of 1200 mm/s allows significantly faster print runs compared to typical FDM printers, reducing time spent waiting for large or complex jobs
  • The 320 x 320 x 430 mm build volume provides ample space for large-format prints without splitting models across multiple runs
  • Automatic bed leveling removes the need for manual calibration before each print, reducing setup effort and the chance of first-layer failures
  • Power loss recovery means an interrupted print can resume from where it stopped rather than being lost entirely
  • The heated build platform and support for PLA, ABS, PET, PETG, and PVA covers a wide range of common and functional filament types
  • Wi-Fi connectivity with smartphone remote control allows monitoring and managing prints without being physically present at the machine
Cons
  • Assembly is required before use, which adds setup time and complexity before the first print can begin
  • There is no external memory slot, so file transfers rely entirely on the single USB port or Wi-Fi, with no option for direct SD or USB drive insertion
  • Automatic support structure generation is not available, meaning support placement must be handled manually in slicing software
  • At 41 kg, the printer is heavy and not easy to reposition or move once placed
  • Operating power consumption of 1300W is relatively high, which is worth factoring in for users running the printer frequently or for extended periods
Who is this for?

This printer is well matched to users who regularly produce large or time-sensitive prints and need both a generous build volume and fast throughput. The 320 x 320 x 430 mm build area combined with a 1200 mm/s rated print speed suits workshops, prototyping environments, or experienced hobbyists who run the machine frequently and want to minimize print times. The support for PLA, ABS, PET, PETG, and PVA makes it flexible enough for both structural and functional parts, and the automatic bed leveling, power loss recovery, and Wi-Fi remote control add operational convenience for users who want to reduce hands-on setup time and monitor jobs remotely.

Who is this NOT for?

Users who need a plug-and-print experience will find the requirement for assembly a barrier, as the machine does not ship pre-assembled. The 1300W operating power draw makes it less suited to environments with limited electrical capacity or users concerned about energy consumption during extended print sessions. Those who rely on direct removable storage for file transfers will also run into limitations, since there is no external memory slot and file delivery depends on Wi-Fi or a single USB port. Finally, at 41 kg, the printer is not a practical option for users who need a portable or easily repositionable setup, or for those working in confined desk spaces.

General info:

file formats STL, OBJ, AMF, 3MF
weight 41000 g
Uses fused deposition modeling (FDM) ✓
Uses stereolithography (SLA) ✕
Uses selective laser sintering (SLS) ✕
height 1030 mm
width 595 mm
thickness 550 mm
volume 337067.5 cm³
warranty period 2 years

The FLSUN S1 is an FDM-based 3D printer that does not use SLA or SLS technology. It measures 1030 mm tall, 595 mm wide, and 550 mm deep, with a total volume of approximately 337,068 cm³ and a weight of 41 kg. Supported file formats include STL, OBJ, AMF, and 3MF, and the printer is covered by a 2-year warranty.

Components:

Creates support structures ✕
Has a heated build platform ✓
1.75mm filament diameter ✓
nozzle size 0.4 mm
3D print speed 1200 mm/s
number of extruder heads 1

The printer uses a single extruder head with a 0.4 mm nozzle and accepts 1.75 mm filament. It includes a heated build platform and is rated at a maximum print speed of 1200 mm/s. Automatic support structure generation is not available.

Materials:

prints with PET ✓
Prints in PLA ✓
Prints in ABS plastic ✓
Prints in PVA ✓

The printer supports a practical selection of common filament materials, including PLA, ABS, PET, and PVA, covering everyday printing needs as well as water-soluble support material work with PVA.

Print sizes:

layer thickness 100 µm
maximum creation size 320 x 320 x 430mm

The printer supports a maximum build volume of 320 x 320 x 430 mm, accommodating large-format prints in a single run. Layer thickness is set at 100 µm, defining the vertical resolution of each printed layer.

Connectivity:

supports a remote smartphone ✓
has an external memory slot ✕
USB ports 1
RJ45 ports 0
supports Wi-Fi ✓

The printer connects wirelessly via Wi-Fi and supports remote control through a smartphone. A single USB port is available for wired file transfer, while there is no Ethernet port and no external memory slot.

Features:

Has a display ✓
has a touch screen ✓
bed levelling Automatic bed leveling
has power loss recovery ✓
Is pre-assembled ✕
operating power consumption 1300W

The printer is equipped with a touchscreen display for direct on-device control and includes automatic bed leveling to simplify setup before each print. Power loss recovery is built in, allowing interrupted prints to resume rather than restart from scratch. The unit draws 1300W during operation and requires assembly, as it does not ship pre-assembled.

Miscellaneous:

prints with PETG ✓

The printer supports PETG as an additional printable material.

Final Verdict

The FLSUN S1 is a large-format FDM 3D printer built around two defining strengths: a 1200 mm/s rated print speed and a 320 x 320 x 430 mm build volume that together make it a capable choice for users who prioritize throughput and scale. Practical features like automatic bed leveling, power loss recovery, and Wi-Fi remote control add operational convenience for regular use, and the broad material compatibility covering PLA, ABS, PET, PETG, and PVA gives it flexibility across different printing needs. The assembly requirement, high power draw, and lack of removable storage are real considerations that prospective users should weigh against their workflow. For experienced users running a workshop or prototyping environment who can accommodate its footprint and setup demands, the FLSUN S1 offers a well-specified platform oriented around speed and build capacity.

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