3D modeling, 3D rendering, and CAD are different but overlapping tasks, which often even use the same programs or file types. All can support (and have supported) digital humanities projects in various ways.
3D printing and scanning, though often spoken about in the same contexts, are two distinct techniques with different potential DH applications.
Virtual Reality (VR) and Augmented Reality (AR) both emphasize physical interactions with virtual imagery. VR emphasizes total immersion in virtual imagery, navigated by the turn of a head or even by walking. AR, meanwhile, superimposes virtual elements over the real environment of a user.
How complicated a VR or AR experience would be to make, and what technology it would require, is highly variable: a single 3D scene that can be viewed from various angles but not moved around in is very straightforward to create and view, and can be made with everything from a 360 camera to 3D rendering software (see above). More complicated or more interactive projects might require mobile app development skills or specialized hardware.
Applying humanistic lenses, theories, and methods to the study of technology can also sometimes fall under the umbrella of digital humanities. This might include an art historian studying Internet art, a literary scholar addressing born-digital texts or interactive fiction, or a historian investigating the people involved in a particular social media community.