I have a Creality CR-10 that I bought a couple of years ago.
It generally works well. It'd probably be better if I stopped messing with it :-)
It's build volume is about 1' cubed. I got it mostly for making enclosures and antenna/mast parts.
I've put some designs up on Thingiverse. The quality is good and getting better with most mods.
My latest modification is a linked dual Z drive that I'm just about done with.
The kids are off to camp soon, so I'll have more time to wrap it up soon.