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FLSUN S1 Pro specifications and in-depth review

FLSUN S1 Pro

Manufacturer: FLSUN

The FLSUN S1 Pro is a delta-style FDM 3D printer designed for users who need a large build area and fast output within a single-extruder setup. It ships partially unassembled and carries a two-year warranty, reflecting a reasonable level of manufacturer support for a machine in this class. At 41 kg and standing 1030 mm tall, it has a substantial physical footprint that should be factored into any workspace planning.

On the technical side, the S1 Pro reaches a print speed of 1200 mm/s and supports a maximum creation size of 320 x 320 x 430 mm with a layer thickness of 0.4 mm nozzle and 100 µm resolution. It handles PLA, ABS, PET, and PETG filaments using a standard 1.75 mm diameter, and includes a heated build platform with automatic bed leveling. Connectivity options include Wi-Fi, one USB port, and smartphone remote support, while the 7″ touch screen provides on-device control. Power loss recovery is built in, and operating noise is rated at 55 dB with a power draw of 1300W during use.

Pros
  • A print speed of 1200 mm/s enables significantly faster job completion compared to standard FDM setups
  • The 320 x 320 x 430 mm build volume accommodates large single-piece prints or multiple parts in one run
  • Automatic bed leveling removes the need for manual calibration before each print
  • Power loss recovery allows interrupted prints to resume rather than restart from scratch
  • Wi-Fi connectivity and smartphone remote support allow print monitoring and control without being physically present at the machine
  • The 7-inch touch screen provides direct, hands-on control without requiring a separate device or software
Cons
  • Does not come pre-assembled, requiring setup time before first use
  • No automatic support structure generation means users must configure supports manually in slicing software
  • The absence of an external memory slot and ethernet port limits offline and wired connectivity options
  • At 41 kg and 1030 mm tall, the physical size demands dedicated workspace that may not suit smaller environments
  • Operating power consumption of 1300W is substantial and may be a consideration for continuous or high-volume use
Who is this for?

The FLSUN S1 Pro is well suited to users who regularly produce large-format prints, given its 320 x 320 x 430 mm build volume and high 1200 mm/s print speed that together support efficient, high-throughput output. Its compatibility with PLA, ABS, PET, and PETG makes it a practical fit for those who work across a range of materials, while features like automatic bed leveling, power loss recovery, and Wi-Fi remote control make it a reasonable choice for semi-experienced users who want a degree of automation without needing a fully managed setup. The large touch screen and smartphone support also make it accessible for users who prefer managing print jobs with minimal reliance on desktop software.

Who is this NOT for?

This printer is not a strong fit for users with limited workspace, as its tall 1030 mm frame and 41 kg weight demand a dedicated, sturdy surface with ample clearance. Those looking for a plug-and-play experience will find it lacking, since the unit does not come pre-assembled and automatic support structure generation is unavailable, placing more responsibility on the user during setup and slicing. Additionally, its 1300W operating power draw makes it a poor match for environments with restricted electrical capacity or for users running extended sessions on shared or limited circuits.

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 Pro is an FDM-based 3D printer, meaning it uses fused deposition modeling as its printing technology, while SLA and SLS methods are not supported. It accepts files in STL, OBJ, AMF, and 3MF formats, covering the most widely used standards in 3D printing workflows. The machine weighs 41,000 g and measures 1030 mm in height, 595 mm in width, and 550 mm in depth, giving it a total volume of roughly 337,067.5 cm³. A 2-year warranty is included, providing a solid coverage period for a machine of this type.

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 FLSUN S1 Pro is equipped with a single extruder head that uses 1.75 mm filament and a 0.4 mm nozzle, a widely used configuration for general-purpose printing. It features a heated build platform, which helps with adhesion and supports a broader range of materials. The printer reaches a 3D print speed of 1200 mm/s, placing it at the higher end of the speed range for FDM machines. Automatic support structure generation is not available on this model, so supports must be configured manually through slicing software.

Materials:

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

The FLSUN S1 Pro supports three filament materials: PLA, ABS, and PET, covering a practical range of commonly used thermoplastics for FDM printing. This selection allows for a variety of print applications, from everyday prototyping with PLA to more durable or heat-resistant output using ABS or PET.

Print sizes:

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

The FLSUN S1 Pro offers a maximum build volume of 320 x 320 x 430 mm, providing a generous amount of space for larger prints or multiple smaller parts in a single run. Layer thickness is fixed at 100 µm, which determines the vertical resolution of each printed object and influences the level of surface detail achievable.

Connectivity:

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

The FLSUN S1 Pro connects wirelessly via Wi-Fi and also supports remote smartphone control, allowing users to manage print jobs without being physically present at the machine. For wired data transfer, it includes a single USB port, though there is no RJ45 ethernet port and no external memory slot available on this model.

Features:

Has a display ✓
screen size 7"
has a touch screen ✓
bed levelling Automatic bed leveling
has power loss recovery ✓
audible noise 55 dB
Is pre-assembled ✕
operating power consumption 1300W

The FLSUN S1 Pro includes a 7″ touch screen display for direct on-device control, making navigation straightforward without relying on external software for basic operations. It features automatic bed leveling and power loss recovery, the latter allowing a print to resume from where it left off after an unexpected power interruption. Operating noise is rated at 55 dB, and power consumption during use sits at 1300W. The printer does not come pre-assembled, so some setup is required out of the box.

Miscellaneous:

prints with PETG ✓

The FLSUN S1 Pro supports printing with PETG, adding this commonly used filament to its range of compatible materials.

Final Verdict

The FLSUN S1 Pro is a capable FDM 3D printer built around two clear strengths: a generous 320 x 320 x 430 mm build volume and a 1200 mm/s print speed that sets it apart from many machines in its class for throughput-focused workflows. Practical touches like automatic bed leveling, power loss recovery, and Wi-Fi remote control add a layer of convenience that makes it a reasonable fit for users with some hands-on experience. That said, its substantial size and weight, the requirement for manual assembly, and the absence of automatic support generation mean it demands more from the user than a fully managed or beginner-friendly setup would. For those with adequate workspace and the technical willingness to configure it properly, the FLSUN S1 Pro offers a solid combination of speed and build capacity that holds up well for regular, material-diverse printing tasks.

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