FLsun SR Super Racer Review

The FLsun SR Super Racer is a Delta 3D printer that prints almost three times faster than the popular FDM 3D printers. But apart from faster printing speeds, what else does the printer offer? Should you buy it? Read on to find out.

Apart from the widespread Cartesian 3D printers, e.g., the popular Ender 3 v2 or the Anycubic Vyper, the other type of printers you can buy are Core XY 3D printers or Delta 3D printers. The latter are exotic and are also considered complicated. Delta 3D printers are also difficult to repair and the maximum size of the printed parts is limited due to the design and the resulting round print bed.
But are all these allegations true? We’ll find out in our FLsun SR Super Racer review below.

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Before the Flsun Superracer, we had tested another Delta 3D printer, the Monoprice Mini Delta V2. The Monoprice printer stood out for its plug & play capability, good results and a reasonable price. The Flsun Super Racer has some work to do given that it’s nearly twice the cost of the Mini Delta.

FLSun Super Racer Specs

Product name SuperRacer
Print speed 150mm/s-200mm/s
Molding Tech FDM
Power 300W
Nozzle Temp ≤260°C
Slicer Software Cura/Repetier/etc.
Nozzle Diameter 0.4mm
Filament Detection Yes
Bed Temp ≤100°
Filament Diameter 1.75mm
Resume Printing Yes
Input Voltage 115-230V
Print Size 260*260*330mm
Filament Support PLA/ABS/PETG
Type Leveling Auto-leveling
Working Model SD Card/USB
Mouth Type Single nozzle
Firmware Open source Marlin
Output Voltage 24V
Machine Size 440″390*960mm

FLsun SR SuperRacer Review

The FLsun Super Racer is well packaged. The printer is made of high-quality metal frame and is shipped with lots of practical accessories in the box.

For such a highly complex mechanism, the printer has an amazingly simple structure. For example, attaching the print head is simply a matter of clipping it in – that’s it! An attachable level sensor measures the print bed. After the print bed has been measured, you can insert filament and you’re ready to print. The easy operation makes this printer suitable for beginners and experienced makers alike.

FLsun Super Racer Slicer

The Flsun Super Racer uses Cura slicer. In the slicer, the print speed is preset to 120 mm/s. If you have some experience with 3D printing, such a high printing number may make you uncomfortable. Generally, we know that if you want clean print results, the print speed should be between 35 and 60 mm/s.

Still, the high print speed was worth a try. And indeed, the quality of prints that the Flsun Super Racer produces at 120 mm/s amazed us.


Assembling a Delta 3D printer is a little bit complicated that with printers of the classic Cartesian structure. The Flsun Super Racer kit consists of a lower and upper platform, and three guide rails. The rails, motors and print head are already pre-assembled. There are also three double connecting rods made of carbon.

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The structure of the Delta printer

To assemble the 3D printer, you have to fix the guide rails to the upper frame with four screws each. After that, attach the lower frame and repeat the procedure.

Now that the chassis is in place, you can start assembling the print head. Simply clamp it into the double guide rods made of carbon tubes. The rods are tensioned with springs and have opposite joint sockets at the end, which you simply clip into the joint heads of the print head and guide rail. The precisely pre-greased joint sockets were particularly pleasing.

So, simply clamp the first double guide rod, and hold the print head on the second and third. Next, connect the construct with the articulated heads on the motor linear rails. That’s it. The construction of the most complicated part of the delta printer system is done. We thought this would be more difficult since it’s usually complicated with other printers.

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Precisely greased: Such details show the high quality.

The next steps are to attach the extruder to the top and connect the cable ends from the top chassis to the printhead. Thanks to different color markings, this works easily and understandably. A cable socket initially remains unused for the calibration unit.

The white Bowden hose is stretched between the extruder and the print head, and the Flsun Super Racer is ready for use.


After switching on the printer, you first need to calibrate it before starting to print. For this, you’ll need the small attachment supplied. Clip the attachment onto the print head from below and connect the cable to the free white end of the cable. After that, it’s time to start the auto leveling.

The software will ask whether the sensor is also clipped on. After confirming this, the Flsun Super Racer automatically measures its pressure bed. Don’t forget to remove the sensor afterwards.

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No questions remain unanswered: the plug connections are color-coded in an exemplary manner.


The software of the Flsun Super Racer is controlled through an intuitive color touch screen. The touchscreen is connected through a coiled cable, and can be held further down or up the strut of the printer using a magnetic holder.

The display is clearly laid out and all the necessary settings are available. The maximum printing speed of the FLsun is 200%.

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The touchscreen control unit is magnetically attached and connected with a coiled cable.

The Flsun Super Racer has quiet TMC stepper drivers, which is clearly evident in operation. In general, the Super Racer is a quiet printer. In normal operation, the loudest noise is from the extruder when it performs the retraction in the event of pressure jumps – i.e. before lifting the print head from the component, it quickly pulls the filament back a little so that it does not pull threads when moving.


The complete housing including the guide rods for the motors is made of metal. Everything is solid and precisely manufactured. The running rails work flawlessly.

The print bed consists of a hardened glass plate coated with carborundum. These plates are the current standard. The bed has a big advantage: the dotted surface with different textures creates tension when the printed part cools down. After cooling, the prints can be easily detached from the print bed.

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FLSun Super Racer: Structure

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The filament processing system consists of a print head that is connected to a dual gear extruder through a Bowden tube. The print head has double component cooling and the brackets for the articulated heads are cast in one piece.

The print speed is breathtaking for the quality of prints that the FLsun Racer produces. We printed the USB holder and the Kalifa at a speed of 120mm/s. We used the magicPLA DEEP SPACE filament from 3D Jake and got a very clean result.

There is only one small drawback, which we’ve also seen with many other 3D printers: the tips become unclean due to the waste heat from the hot nozzle.

After that, we wanted to test the Super Racer print quality at higher speeds. Can we print the Pantheon at 200mm/s and the Zip Tie Holder at 300mm/s?

At 300 mm/s even, the the Flsun Super Racer starts becoming noisy, but the pressure became very good.

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FLSun Super Racer: Print results

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The only real disadvantage of the Flsun Super Racer is the spinning, which makes it pull strings. We first noticed strong spinning with the cable tie holder. To solve this, we increased the retract speed in the slicer settings in Cura. This made things get much better. However, we could still see wafer-thin threads.

You can melt the threads using a Bunsen burner. I think this issue happens because the retract speed just isn’t high enough to compensate for the rapid pressure movements. Also, the long path of the filament from the extruder to the nozzle via the Bowden hose could be leading to this problem. This distorts the fast retract times. Ultimately, it’s a matter of fine-tuning the pressure and retract speed.

FLsun Super Racer Problems

The FLSUN Super Racer (SR) is a popular delta 3D printer, but like any machine, it has its share of known issues. Here are some common problems you may encounter:


  • Auto bed leveling: This is a frequently mentioned issue, with users experiencing inaccuracies or inconsistencies in the auto bed leveling process. It might require manual adjustments or firmware updates.
  • Z-offset: Maintaining the correct Z-offset (distance between nozzle and bed) can be challenging on delta printers. Inconsistent extrusion or adhesion can be symptoms of incorrect Z-offset.


  • Hot end: Clogging or jams in the hot end are reported, potentially due to PTFE tube issues or filament problems.
  • Fans: Some users encounter noisy or malfunctioning fans, affecting temperature control and overall printing performance.
  • Carriage rods: Wear and tear on the carriage rods can lead to decreased print quality and accuracy.


  • Firmware: Bugs or compatibility issues with firmware can cause printing errors or unexpected behavior. Updating to the latest version might resolve some issues.
  • Slicing profiles: Finding the right settings for your filament and printer can be tricky. Using incorrect profiles can lead to failed prints or subpar results.


  • Power supply: Some users report issues with the power supply, such as voltage fluctuations or overheating.
  • Noise: Delta printers can be inherently noisier than other types due to the fast movements of the carriage.

FLSun Super Racer Upgrades

The FLSUN Super Racer (SR) is a capable delta printer, but like any good machine, it thrives on improvement. Here’s a deeper dive into popular upgrades, categorized by their impact:

Essential Enhancements

  • Magnetic PEI Flex Plate: Ditch the glue and tape struggles! This upgrade offers effortless print adhesion and easy removal, making your printing life smoother.
  • Dual 5015 Radial Fans: Unleash your high-temp filament dreams! Upgrading the fans significantly improves part cooling, combating warping and ensuring dimensional accuracy.

Performance Powerhouse

  • Bi-metal Heat Break: Break free from temperature limitations! Upgrade to a bi-metal heat break and unlock the potential of high-temperature filaments like nylon and polycarbonate.
  • Volcano Heat Block and Nozzle: Print faster, print hotter! This combo enhances heat distribution for speedier prints and accommodates diverse hotend setups.
  • Direct-Drive Extruder: Eliminate the Bowden blues! A direct-drive extruder provides precise filament control, boosting print quality and minimizing jams.

Beyond the Basics

  • Klipper Firmware: Embrace ultimate control! Klipper unlocks advanced features like pressure advance and resonance compensation, pushing your printer’s capabilities to new heights. However, it requires technical expertise for configuration.
  • Part Cooling Ducts: Optimize airflow, optimize prints! Upgraded ducts direct cooling more effectively, further reducing warping and improving print quality.
  • Printed Hotend Effector Housing: Cool it down! A custom-printed housing enhances airflow around the hotend, contributing to better temperature control and print consistency.


  • Skill Level: Advanced upgrades like Klipper might require deeper technical knowledge. Choose mods that align with your comfort level.
  • Budget: Upgrades range from affordable to premium. Define your budget before diving in.
  • Printing Needs: Focus on upgrades that address your specific printing goals. Not all mods are universally necessary.

Bonus Tip: Explore the FLSUN community forums and YouTube channels for detailed upgrade guides, user experiences, and troubleshooting tips. With the right upgrades and a touch of tinkering, your Super Racer can transform into a printing powerhouse!


The Flsun Super Racer is an extremely fast and quiet 3D printer under $500 with a decent medium-sized build space. If you want even more luxury, you should wait for the Flsun V400 High Speed, which has a direct drive extruder and an installation space of 300 x 400 mm.

If you have a lot of models to print, you will definitely be satisfied with the Flsun Superracer. This is especially if the prints will fit the 260 mm print bed area in diameter is sufficient.

If you are looking for a cheaper printer, you have to make compromises in terms of speed. We recommend checking these 3D printers under $400 or these 3D printers under $300.


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