It is supposed to make rods on FLSUN QQ-S PRO printer jiggle less (idk how to call it), so it doesn't mess up printing quality (as I've read).
You can adjust tention of the rubber bands by rotating the hooks
100% infill, that's all
I don't really know how to design stuff so don't yell at me yall
Mount it however you like, but just in case you can imagine it, I've attached photos on how I did it. (It's gonna be different for different rubber bands)
The author marked this model as their own original creation.