I’ve ordered an FLSun SUprRacer (SR) to replace my current FLSun QQS-Pro, but won’t have it for another month or so. Consequently I’ve been reading every review I can find abou tthe SR, and this is the best one I’ve found so far:


Here are some comments about the review based on previous experience I’ve had while working on upgrades to an old delta printer (Atom2) I replaced with a QQS-Pro more than a year ago:

Plastic caps: this is the first review I’ve seen that mentions grease on the plastic caps. The printer I worked on had magnetic ball rods, and those required occasional grease – I used white lithium grease that worked well for more than 4 years. I expect similar results with the SR.

PTFE lined hotend: I’ve had a lot of experience with this type of hotend. The key issue is getting good contact between the ends of the PTFE tube and the top of the nozzle. Any gaps will allow melted filament to leak out of the top of the nozzle and cause a nozzle jam. You have to make a good 90 degree cut at the end of the PTFE and ensure it is pushed all the way up against the top surface of the nozzle.

I’ve already bought a meter of Capricorn tubing that I will use in place of the PTFE that comes with the SR. Capricorn allowed me to virtually eliminate stringing on my QQS-Pro.

Motherboard & steppers: I’ve used the BTT SKR 1.4 Turbo board but had to replace it when the microSD card reader failed. The board’s design was fine, but I don’t understand why the SR’s board uses 2209 steppers that are hot-glued in place. The 2209’s are great because they make it possible to control their voltage via firmware if the firmware allows that – which it appears the SR does not.

This is the first board I’ve seen that has a fan dedicated to cooling the steppers. Could it be that their voltages are set a bit high, so they get hot enough to require their own cooling fan?

Power supply: For my Atom2 upgrade project I bought a Meanwell 24V power supply that works well. I’ve thought about swapping out the SR’s power supply for this one, but I’m not sure if the sizes are trhe same. Also, the way the wires are connected to the SSR supply differs from the Meanwell, so that will require some checking out.

3.5″ touchscreen: This is an interesting device unlike any screen I’ve seen for a 3D printer. For my Atom2 upgrade I purchased a BTT TFT70 – a 7″ color touch screen that is just great. I’d like to know if there is separate software that defiines the screens shown on the SR’s 3.5″ screen (there is such software for the TFT70) and if there is a way to display the standard Marlin text only screens on it. The Marlin screens let you do things like adjust lots of firmware parameters in RAM withut the need to recompile the firmware itself. Stepper voltages is one of these.

Printing experience: the printed parts shown in the review are not at all like the things I typically print, but they did apear to be very high quality. I’m quite confident the SR will do just fine with the typers of prints I usually make.

Noise level: quite comparable to my QQS-Pro after I upgraded it to the new Hi-Speed motherboard and 2208 stepper drivers.

IdeaMaker slicer: this is the first time I’ve seen a writeup on this slicer; I’ve standardized on PrusSlicer for quite a long time. But I’ll check out IdeaMaker to see how it compares.

Dimensional accuracy: this has never been a major concern of mine vecuase I don’t usually print things that have to be dimensionally accurate. The good news is the SR seems to be quite accurate, which means FLSun has done a good job is specifying the printer’s dimensional parameters.

Klipper: I know nothing about this firmware; it may or may not be any benefit for the types of prints I make. I’ll be interested to see info about using Klipper on the SR.

Last Update: 11 May 2021