MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I have lots of good ideas, but I don't know how to design. Lol. I was picturing the outer part of the arm sliding over the inner. It would have a slot in the bottom of the outer, and a 3mm screw hole in the inner. Then you could 3mmx6 or 8mm screw to hold it in position. This would allow you some options for adjusting. My case is huge because it's got any extra battery so I would think 20mm wide arms to hols phone would be the biggest you'd need to go. And then down from there.