In-Depth Review: Flsun S1 3D Printer – Performance, Features, and Verdict

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The Flsun S1 stands out not only for the machine’s size but also for its impressive speed and build quality, which all come together to make this a great option for business, education, and experienced engineers. Its delta design allows for faster movements and smoother prints, while the user-friendly interface ensures a straightforward printing process. Although it lacks some advanced features, such as out-of-the-box multifilament printing, limited software, and print accuracy, which is lower than more expensive delta options, the overall performance and value make it a strong option for education and business.

High-speed printing

User-friendly interface

Excellent print quality

Limited to single filament

Larger footprint due to delta design

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The Flsun S1 is a delta 3D printer, a design that in the past has been known for speed and precision, although the mechanics are somewhat complicated, which has made servicing for most a little more tricky than the more common Cartesian style. Like the Cartesian counterparts, delta technology has leapt forward at a pace as we recently saw with the superb TriLab AzteQ Industrial. The Flsun follows in the same vein of design but adds more features and comes in at almost half the price while offering a huge 320 x 430 mm build area.

The machine’s delta kinematics come in a fully enclosed casing with a few additional features that make this not just one of the best 3D printers for business we’ve tried, but also one of the most interesting high-end enthusiast, professional machines on the market at present. One of those features is the built-in dry filament box at the top, which helps to keep the filament in the best possible condition during the print process. AI tools join this, and a print speed that makes some of the other hyper-speed printers look decidedly slow.

The design of the Flsun S1 is large, with the machine measuring 550 x 595 x 1030 mm. This means that you’re going to need some space to place it, and when you consider the doors to the enclosure to cope with as well, this isn’t a standard desktop printer. If you do go to place it on a surface, make sure it’s good and strong; a standard IKEA desk, for instance, will bend under the 41 kg weight.

The size, weight, and design mean that this is a machine that, once placed, is best left where it is, making it ideal for a workshop, classroom, or office where you know the machine won’t need to move regularly. Out of the box, there are a few steps to go through before printing, but when it comes to construction, there are only a few small items to attend to. The first is to bolt on the doors; again, the size of these makes the process a little fiddly, but with some help, it’s easy enough. Then it’s just a case of removing a few retainer screws and zip ties, and you can plug in and power up, ready to load the cable. The only other parts that need to be attached are the large touchscreen and control panel.

The build process takes less than ten minutes, and the machine is 95% ready to go. During this time, you can check out the quality of the frame and construction, which is solid and ensures maximum stability during the high-speed printing process.

The dry box at the top, which houses the filament, is quite an interesting design feature; this is something unique at this price point. At the base of the machine is the large touch screen; this is beautifully designed, and the UI is clear with good icons and layout. The only other real area of interest with the design is the removable PEI build platform, which enables you to remove prints when finished easily.

The Flsun S1 boasts a range of features that complement the high-speed delta kinematics and help ensure fast and smoother prints with fewer failures.

Some of the key features include speed, with a maximum of 1200 mm/s, which is double that of most fast printers and enables extremely fast print production. Maximum acceleration speeds of 40000 mm/s² and a flow rate of 110 mm³/s when using fast PLA all add to the machine’s high-speed capabilities.

When it comes to print size, the S1 is one of the largest printers at this price point, with only the Elegoo Giga Orange beating it in pure scale. The print area is 320 x 430 mm, providing ample scope for what you can print onto the PEI flexible print platform.

What’s interesting about the design is that it’s fully enclosed, making it extremely neat in the workshop, with no reels sitting externally as with other large-scale printers. The inclusion of the built-in dry box for a single reel is a great idea and helps to boost the quality of prints. This dry box is a separate section above the main print area. Another environment-enhancing feature is the CPAP high-pressure turbofan that helps maintain an ideal temperature in the build area for the material you’re using.

Print Technology: FDM  

Build Area: 320 x 430 mm  

Minimum Layer Resolution: 0.1 mm  

Maximum Layer Resolution: 0.35 mm  

Dimensions: 550 x 595 x 1030mm mm  

Weight: 41 kg  

Bed: Heated  

Print Surface: Textured PEI Print Plate

Software: FLSUN Slicer

Materials: PLA, ABS, PETG, TPU, and more  

Print Speed: Up to 1200 mm/s

Print reliability is a huge consideration for Flsun, especially with a printer this size, which can go through a kilo of filament in a surprisingly fast time. To help avoid print failures, a binocular structured light system monitors the print and detects if anything goes wrong. This system consists of two cameras and a micron laser. It is coupled with AI tools that further support the detection of any issues.

One of the energy-saving features that we’re starting to see more of is intelligent zone heating. We first saw this at the consumer level on the Elegoo Neptune 4 Pro and, more recently, on the professional Original PRUSA XL. Here again, a zone system is used so that only the parts of the build platform that are in contact with the base of the print are heated.

A common feature of all 3D printers these days is auto-leveling. Here, it’s slightly more advanced due to the delta design, so having an advanced computer system behind the scenes helps to ensure that all-important first-layer accuracy.

Alongside auto-leveling are a few new and emerging features, such as DPA (Dynamic Pressure Advance), that help ensure each layer sticks, as well as growing features such as vibration reduction.

While PLA is mostly odorless, many other materials do produce an odor. To help combat this, the S1 has a built-in filter that reduces the gases that can escape the filament during printing, making it safer to use in an office or workshop without ventilation.

The initial set-up of the printer is relatively quick and straightforward, but it should be noted that this is a two-person task as this printer is larger and heavier than most. Just removing it from the box takes some effort, and once you get the machine in position, you won’t want to move it again.

The machine arrives nearly ready to use; simply attach the doors and the control panel, power it on, load the filament, and you’re all set. It includes a USB with a variety of models to print, allowing you to verify that everything functions correctly. Our assembly process took about 15 minutes, mostly spent securing the door while the hinge was screwed in place. Loading the filament was straightforward but a bit tricky due to limited space between the filament roll and feeder tube, requiring insertion and pushing before the filament could be installed.

Filament loading was swift, and the hot end reached the required temperature remarkably fast as the filament was loaded. Once this is done, the machine is ready for use. Initial test prints from the manufacturer were completed quickly and with impressive precision. For instance, the 3D Benchy test printed in just over eight minutes, roughly five minutes faster than most high-speed printers.

Among the test prints, the vase stood out due to its exceptional quality. Although the slicer’s vase setting wasn’t enabled, resulting in a seam, enabling this setting for other vases yielded impressive results.

Real-world tests with various materials highlighted the printer’s speed and quality. The only drawback was the noise level. Inside, there’s a noticeable turbofan that is hard to miss when the machine starts a print or overheats. However, for most tasks using PLA, opening the door of the enclosure can help regulate temperature and reduce the fan noise, or you can turn it off through the settings. Nonetheless, compared to some ultra-low noise printers we’ve seen recently, this one is a bit more industrial in its noise output.

The benchmark tests were carried out after running through several reels of filament. While the prints looked exceptional, the print accuracy needed to catch up to some of the latest printers. Print dimensional accuracy was slightly lower than expected, and while it coped with the negative features, overhangs, and bridging well, it was all a little off what was expected. We are talking about measurements of a few microns rather than millimetres.

With the small issues aside—and they are small—the speed and print quality make this a superb professional choice. It enables you to turn around print iterations quickly. In an educational environment, it enables you to print out students’ work quickly and between lessons, which again will make a huge difference to workflows.

The Flsun S1 directly competes with the excellent TriLab printers and, in many respects, takes the edge when it comes to overall print quality. However, there are a few small issues, such as feeding the filament into the machine, which can be a little tricky due to the position of the feeder tube. Likewise, once the filament has finished, it rarely unloads back through the feeder tube quickly, requiring you to unlink the feeder tube closer to the tool head. This process takes a few seconds but still needs to be a more neat solution than you would expect.

The rest of the build is superb, and the huge touchscreen and interface are one of the best on the market. The remote printing function works well, but the quality of the prints really stands out. If you look at the prints in isolation, they are among the cleanest that any printer has produced, but when you consider the pure printing speed, it becomes even more impressive.

The Flsun takes a different approach to design than most, enabling a printer with a huge print area and a speed and accuracy that are hard to beat. For product design, engineering, and especially education, this is one of the best printers out there for pure simplicity, speed, and quality of finish. However, you do need to be aware of the fan noise, which can be excessive.

The Flsun S1 combines speed, quality, and ease of use in a robust package. Its delta design allows for fast and smooth prints, while the user-friendly interface and auto-leveling system ensure a hassle-free experience. Despite some limitations, the S1’s overall performance and value make it a strong contender in the 3D printing market.

Buy it if…

You want a high-speed 3D printer
The delta kinematics allow for faster print speeds without sacrificing quality.

Ease of use is important to you

The touchscreen interface and auto-leveling system make the S1 very user-friendly.

Don’t buy it if…

You need multifilament printing

The S1 currently supports only single-filament printing.

Space is limited

The delta design requires more vertical space compared to other configurations.

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