Buyer's Guide

FLSUN Super Racer Upgrades: Paid and Free

In this article I will share some of my favorite FLSUN Super Racer upgrades which improve this already capable delta printer. Before upgrading anything to your printer, I recommend checking the 3D Printer Upgrades for Beginners article to better understand when and why to upgrade your machine.

As always, before jumping in the 3D printer upgrades train, I recommend reading the 3D Printer Upgrades for Beginners: When and Why? article to have a better understanding about how upgrades can improve the print quality of your 3D printer.

FLSUN Super Racer Paid Upgrades

Magnetic PEI flex plate

Addin a Magnetic PEI flex plate is probably one of the best upgrades you can do to any printer because it eliminates any kind of adhesion issues you might have. While this is one of the more expensive upgrades, I think it’s totally worth it for the FLSUN Super Racer, especially if you plan to print fast. I previously reviewed the ENERGETIC double-sided PEI flex plates so check the article to learn more about these print surfaces.


Besides improved adhesion, it’s much easier to remove prints when they are complete. Just remove the PEI sheet and with a quick bend, the print will pop right off. For me, adding a PEI sheet is one of the best FLSUN Super Racer upgrades to be made.

The magnetic PEI flex plate can be bought from the following websites:

Dual 5015 radial fans

I also mentioned in my FLSUN Super Racer review that the included 35mm radial fans are underpowered compared to the printer’s capabilities. You could push the print speeds much further with better part cooling and that’s why I upgraded my FLSUN Super Racer with dual 5015 radial fans. These fans do a better job in pushing a larger volume of air over your print, helping the printed layers to cool faster.


When purchasing fans, I recommend to always buy dual ball-bearing variants. They are more expensive, but they last longer and it’s especially important to have superior quality fans when printing fast. Regular sleeve bearing fans can quickly fail because of the quick movements done by the printer.

In my opinion, installing dual 5015 radial fans is one of the mandatory FLSUN Super Racer upgrades because this is the main limiting factor when printing fast with this printer.

Dual bearing 5015 24V radial fans can be bought from the following websites:

Bi-metal heat break

The FLSUN Super Racer uses a PTFE lined heat break which is only good for up to ~240C until the PTFE tube starts to degrade. Besides that, it’s more susceptible to clogging because if your PTFE tube is not pressed against the nozzle correctly, molten filament can leak and cause a clog.

If you are looking to upgrade the heat break to an all-metal variant, I recommend looking for a quality bi-metal heat break. This kind of heat break has a much better thermal performance and can actually help with reducing retraction values. Plese note that these heat breaks are more fragile, so take extra care when installing one. I previously reviewed multiple bi-metal heat breaks and most of them worked well.

Trianglelab Bi-Metalic Heatbreak (3)

If you are concerned about their longevity, then you can also get a titanium heat break which is sturdier and less expensive, but the thermal performance is a bit worse compared to the bi-metal variant. Don’t forget that you need to puchase the smooth variant, not the threaded version.

Bi-metal heat breaks can be bought from the following websites:
Slice Engineering

Volcano heat block with quality nozzle

As you know, the included Volcano-like heat block is not as big as an original Volcano variant. While this works, I recommend purchasing a full-size Volcano heat block which is bigger and can hold the full nozzle inside it. That way, your flow rate will be increased.

Plated Copper Volcano Heat Block

At the same time, I also recommend purchasing a better Volcano nozzle. The included nozzles are fine, but you can get much better machined nozzles for just a few dollars. You can read my Ultimate Nozzle Comparison article to learn more about the available nozzles.

Volcano heatblocks can be bought from the following websites:

Better PTFE tube

If you are looking to have a bit more control over your filament and extrusion quality, and lower your retraction values, I recommend purchasing a PTFE tube with better tolerances. The most popular PTFE tube is made by Capricorn and it’s quite good. But if you are looking for something cheaper, there are a few options available online which are of similar quality.


The main reason you would upgrade the PTFE tube is to have the filament a bit more constrained inside it. That way, retractions and extrusion is more accurate.

PTFE tube can be bought from the following websites:

Direct-Drive extruder

On a Delta printer, it’s really important to minimize the weight on the effector, to be able to print fast and without printing artifacts. But I’ve seen an interesting mod online when a SR user installed the Sherpa Mini extruder in a direct drive configuration.

Sherpa Mini V1 | FLSUN Super Racer Upgrades: Paid and Free

Considering the reduced weight of the Sherpa Mini, and all the benefits of having a direct drive extruder, I think it might be worth it. I will order a Sherpa Mini and perform the same upgrade soon.

The Sherpa Mini extruder can be bought from the following websites:

FLSUN Super Racer Free Upgrades

Better part cooling ducts

If you want to upgrade the cooling capabilities of the FLSUN Super Racer, then you need to upgrade the fans. And you can’t do that without also printing some air ducts for them. I printed this dual 5015 fan mount and the upgraded air ducts. This combo works well for me, and the fan airflow is much improved compared to stock.

Printed hotend effector housing

While the stock hotend cover is fine, you could print a modified housing for it which provides a bit more bracing to the top of the hotend. Besides that, the back side is open to improve airflow and allow air to pass easily over the heatsink.

If you’re planning to install Klipper firmware, this effector housing is helpful because it also comes with an ADXL sensor mount which is required for calibrating the input shaper/resonance compensation feature.

Klipper firmware

Klipper firmware can be considered a free upgrade if you already have a Raspberry Pi laying around. You can read more about the process of installing Klipper on the FLSUN Super Racer in my guide. In a few words, installing Klipper will add Wi-Fi capabilities to your printer, a Web GUI interface which can be used to control it, and the possibility of pushing the print speeds faster, without losing print quality.

While the stock Marlin Firmware works quite well, I started to get used to having web controls for my printers, and Klipper is also really nice to work with. So, if you’re feeling adventurous, then make sure you give it a go.

Wrapping up

Hopefully, this article helped you find some FLSUN Super Racer upgrades suited for your machine. I also recommend checking the Essential 3D Printing Tools for FDM and Resin 3D Printers. You might find some helpful tools for your day-to-day 3D printing needs. If there’s any useful upgrade I’ve missed, feel free to leave a commend below.

If you want to chat, then feel free to join the 3DPrintBeginner Discord Forum where there’s a dedicated FLSUN section.

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Latest Replies

  1. Just had a quick question concerning the heat breaks. Do the ones listed work with the stock heat block, or is the upgrade to a full volcano required to use them? Currently having a leak issues with the slice copperhead c-e

  2. Yes, they should work. Ensure that the threads in the heatblock are clean, and tighten the nozzle against the heat break.

  3. hi , i have a flsun sr and its my first 3d printer but i have been looking into upgrading the fans to the one suggested in the article because i have noticed that sometimes becuase of poor cooling, the first layer unsticks, however, i have not been able to find a detailed guide as to how install those fans so i was wondering if yall knew where i can find how to do it.

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      1. But to answer the question more directly, the one I purchased this week 12/3/2021 did not have any issues and seems to have the nano motherboard rather than the original skr 1.3 clone. So if you are having the pause issue, reformat the SD card, and if you have one of the current models this no longer seems to be an issue…

  1. Hi there new 3d printer user. Any chance you could make a guide on installing the Dual 5015 radial fans on the SR?

  2. Very interesting Information. I am thinking of purchasing the SR but i didnt want these fake volcano. Can you tell me, if an complete e3d original V& Hotend fit on the SR? I want to change everything, not only the heatblock.

      1. Thank you for the fast answer. I ask, because i would change the complete hotend to revo next year. But we will see.

          1. that was the main reason fpr my question. Maybe on black friday i buy an SR and will have a look myself.

          2. Did you ever get the Revo up on this? I would love an update to see if it’s worth because this will be the next printer I get.

          3. I had a few versions of the Revo on the Q5. It was my testing machine during the beta testing period. It worked well.
            But I don’t have the retail version to confirm how it works.

  3. how easy do you think it would be to convert to the dragon hotend rigidly mounted?
    ive ordered the SR and was thinking of building it out for super fast prints with the sherpa mini and dragon high-flow for maximum performance with minimum weight on the effector

  4. By the way, If clicking on the link to the fans, pay careful attention to the result. Despite the search terms saying 5150 and 24v, amazon in their infinite dickery recommend a pair of 12V ones.. BE SURE you don’t just go with their recommendation, go back and search again if needed, do not just click buy without being careful to check the voltage on the item. Ask me how I know…

  5. I’m really interested in installing a sherpa mini in a DD extruder configuration, will you be positng a guide for us beginners?

    1. Agreed, i would love to see a howto – or at least what files were used to print the adaptors please!