I have been designing mechanical things since 2004 and 3D printing at home since 2012.
This user joined on 09/07/2018.
I recreated a functional Iris ring in the style seen in Star Wars The Last Jedi.
I recreated the automatically extending bat from Back To The Future Part II. This build doesn't use any electronics at all.
I recreated the Neuralyzer from Men In Black, with 3D printing and some simple electronics.
I 3D printed a life-size C3PO head, which could play various WAV files via Arduino control.