seemecnc, eris, orion, hatchbox, that newer company that makes a giant industrial one with screw extruders instead of using filament, (some female name that I forget) "deltaprinter", joren, geeetech...

there's a shedload of prebuilt units that require... some assembly, but given the size of them and empty space wasted in the packaging it's rare to see one that needs no assembly at all. They are prebuilt in the sense that you only need to put a few bits together out of the box.


There are lots of them out there on the market.

I think though that they're not terribly complex to assemble compared to a corexy or even a prusa (mostly to do with belt tension and stuff I would think) so most companies just sell the kits.