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FLSun S1

Year Released:
Build Volume:
320 x 320 x 430 mm (~12.75 x 12.75 x 17 in)
Price Range:
$1650 - 1675

About the FLSun S1

The FlSun S1 is FLSun’s flagship delta printer, claiming print speeds up to 1,200 mm/s, with a maximum acceleration of 40,000 mm/s². The maximum flow rate for PLA filament is 110 mm³ per second. The Flsun S1 measures 550 x 595 x 1030 millimeters and weighs an impressive 39 kilograms, with a printing chamber that is 320 millimeters in diameter and 430 millimeters high. The print nozzle is an all-metal hot end that can be heated to up to 350 °C and has a diameter of 0.4 millimeters. The print bed can be heated to up to 120 °C; where the use of PLA, PETG, TPU, ABS, and carbon is supported. The print bed can be heated in zones. A LiDAR sensor system should ensure high accuracy of the first layer, while leveling and Z-axis compensation should be automatic. A camera is installed, so the AI should then be able to detect errors, which also enables time-lapse recordings to be made. Operation is said to be particularly easy thanks to a seven-inch touchscreen with a resolution of 1920 x 1080, which also supports a connection to a PC. The exhaust air from the FDM printer is not simply released into the environment; instead, a HEPA and an activated carbon filter are used. The S1 also leverages a closed-loop stepper motor system and there’s also “microtac radar”, which works to improve print quality, accuracy, flow, and prints’ first layers. Perhaps most interesting about the S1 is its dedicated chamber for filament drying, as well as stock temperature and humidity monitoring. That, combined with a “newly designed” FLSun OS system, creates a powerful printing platform for the experienced user looking for fast results.

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Benefits of the FLSun S1

Auto bed leveling - auto bed leveling will ensure your prints have perfect first layers every time and greatly reduce issues with bed adhesion. When using an auto-leveling system, the probe allows better tolerances for slightly warped print beds by measuring and compensating for any inconsistencies. Without this feature, you'll need to adjust the bed level manually using nuts on each corner of the print bed.

Has touch screen - having a touch screen isn't a deal-maker or breaker, but it is a convenient feature that makes it easier to navigate the interface when you are printing files and configuring 3D printing settings.

Premium components - This printer is known for using the highest quality components, and prioritizes this over providing a lower price point on their printers.

Fully assembled - This 3D printer is shipped completely assembled, and is ready to plug in and start using as soon as you unbox it. You will still need to follow the included calibration procedures, but this will not take a significant amount of time.

Direct drive extruder - Direct drive extruders are mounted right above the hot end, and push the filament directly into it, as opposed to a side mounted bowden extruder setup. We prefer direct drive extruders to bowden since they are less prone to jamming and typically require less maintenance. they also are much easier to use with flexible materials

Generous Build volume - A larger than average build volume means that you will be able to print larger parts without the need to split them into pieces and attach them together, which is especially useful with functional parts. If you have the room for the larger footprint, we definitely recommend going with a larger 3D printer, since you can always print small parts on a larger printer.

Wireless printing - In addition to the standard USB and SD card connections, you can connect wirelessly to this printer to print from your computer or mobile device.

All-metal hot end - An all-metal hot end allows for printing at high temperatures up to 300C, while standard hot ends are capped at 260C before the PTFE material begins to degrade. All-metal hot ends are also less susceptible to jamming, and do not degrade as fast.

Enclosure - An enclosure seals air around the print area. This holds warm, still air around the print area and is essential for printing temperature-sensitive materials like ABS. Enclosures also prevent particulates and gasses from being emitted into the surrounding area, increasing safety. They also greatly reduce printer noise.

Dual gear extruder - A dual gear extruder grips filament from both sides and can exert much more force on the filament before slipping. It helps with all filaments but especially with flexible, slippery TPU.

Disadvantages to consider

High price tag - While this printer includes a lot of premium features, they come with a price. This printer is one of the more expensive consumer printers, and may not be worth the cost if you are willing to sacrifice some of the high end features.

Where to buy the FLSun S1

Click here to view the FLSun S1.

Brand Summary: FLSun

FLsun is recognized in the 3D printing market for creating affordable printers that are accessible to a wide audience, from beginners to more advanced users. A distinctive aspect of FLsun's lineup is their focus on Delta printers, which are known for their speed and efficiency. Delta printers, characterized by their unique triangular structure, allow for faster print speeds compared to traditional Cartesian printers. This design can enhance print quality for certain types of projects but may also present a steeper learning curve due to their distinct calibration and maintenance requirements. Despite the advantages of speed and user-friendly assembly that FLsun printers offer, users might face challenges with noise during operation and navigating customer support or finding replacement parts. These issues point to areas where FLsun could improve to enhance user satisfaction. Overall, FLsun's commitment to Delta printers showcases their innovative approach in the 3D printing industry, making advanced printing technologies more accessible. However, the balance between affordability, performance, and after-sales support remains a crucial factor for potential users to consider.

Learn more about FLSun.


  • Auto bed leveling
  • Has touch screen
  • Premium components
  • Fully assembled
  • Direct drive extruder
  • Generous Build volume
  • Wireless printing
  • All-metal hot end
  • Enclosure
  • Dual gear extruder


  • High price tag

Printer Comparisons

You can compare the FLSun S1 to other 3D printers using our Compare tool.

Details & Specifications


Year Released
Scale Model:
Build Volume
320 x 320 x 430 mm
Bed Material
PEI Spring Steel
Nominal Maximum Speed

Extruder & Hot-end

Extruder Type
Direct Drive
Extruder Construction
All-Metal Dual Gear
Hot-end Construction
Cooling Fan
Rear mount

Physical Characteristics

Physical size
550 x 595 x 1030 mm
Fully Enclosed


Auto Leveling
Assembly Time
Fully Assembled
User Interface
Full Color Touch Screen
Built In WiFi Support
Other Features
Built-in belt tensioner


Base Voltage
24 V
Quiet Motor Drivers

Where to Buy


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