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So I wanted a small, and thin friction hing for another project, and I couldn't find the metal ones that they use for the iPad's Magic Keyboard case. So I design my own the parts I had on my desk.
The smallest nut that I had was 4mm wide which really limited how thick the design can be. The result is this
It folds flat at measure at a maximum thickness of about 10mm
It works a lot better than I thought it would, especially since this is my first prototype print. Need to figure out some things, like to stiffen the arms and to prevent/reduce twisting.
But as a basis to start from this works nicely. I think if I add a TPU washer on the back end, I might be able to get it stiffer and more consistent feeling. But I'll do that at another time.
I've been at this for years, most of my designs are like your solid parts (Display Stands and DS Stylus). I've only recently tried experimenting with moving parts, and I've found using mixed mediums the best when 3D printing. i.e. using cloth or leather as the moving medium, with TPU or PETG for strength/flexibility.
As for what this is for. I've designed and made 3D Printable e-reader cases, which this link will show you the printable parts for, but I'd like to make a case for my iPad and other tablets, however I want to be able to prop it up and for it to be stable. This is designed with my cases in mind, and it has the clearance to lay flush with the back panel.
End goal is to have this embeded in the back so I can prop it up landscape, while I have another in the sleep cover so it can be propped up portrait, like an easel.
Fantastic! My first thought was either a miniature display table or maybe a small parts case-and-table combo.