I am exploring a web service called Sketchfab (https://sketchfab.com/) that allows users “to publish, share and embed interactive 3D models online in real-time without plugin.” This site is not for downloading 3D models but rather for displaying them online for portfolios, clients or fun.

It’s free to register, upload and embed and there are various monthly plans for professional use. One of the paid plans is offered for free to students in “partnered” institutions.