No. He does use supports, but not in the way you might imagine. Inspired by creating cast iron using sand casting, he decided to first 3D print a reusable “core” using PETG.

[DaveMakesStuff] demonstrates a great technique for 3D printing a sphere; a troublesome shape for filament-based printers to handle. As a bonus, it uses a minimum of filament. His ideas can be appl… ...

Another hinderance is the use of supports in 3D printing. 3D printing can be a pretty intense process. You have a big machine, moving rapidly back and forth, shooting powders/metals out of a pointer.

Wheelson in particular used 3D printing in a huge way, with the wheels being entirely 3D printed along with all the internal support brackets and exterior details.

D printing has come a long way since its invention in 1983 by Chuck Hull, who pioneered stereolithography, a technique that ...

Additive manufacturing adoption is growing across shop floors globally, evidenced by more than 70% of enterprises finding new applications for 3D printing in 2019 and 60% using CAD, simulation ...

Update: Prusa has released a new version of the MK4, the MK4S. It's an incremental upgrade but adds a lot of great features.