the printer is awesome for the price. very functional out the box. I got another one because you cannot beat that price... I think they have it up in error because it has most everything you want for a gantry-style printer. for 310x310x400 build volume it cannot be beat. My CR-10 is 4 years old at least now and needs a full rebuild/tuneup. I don't even want to think about how many hours its been running.
*edit:*
the firmware on these SunLu S9s is great. I'm not changing a thing. will just print for as long as I can.
guess not an error:
SUNLU Official Online Store, Free Shipping. You can buy SUNLU 3D printer filament like PLA, PLA+ filament, Filament Dryer and 3d print resin for your 3d printer.
www.sunlu.com
its nice they offer their Marlin install right there on the site...