Ok, I can see the above model when I'm logged out, but you still need a (free) account to download or copy it. I guess that'll have to do for now.
There's one additional issue with a design like the one above: there are 3 separate parts that I keep in the same folder for organizational convenience, but when I go to print them, I download 3 separate stl files so I can orient and duplicate them individually in the slicer software. The download link above only lets you copy the design as a single file, and the Photon slicer (at least) treats them as one object, understandably. But if you have a TinkerCAD account, you can copy it and export the individual pieces yourself.