My wife loves to read on her iPhone, but has problems with her fingers and wrists cramping up after a while. I designed this so that she can relax her wrists and fingers and still enjoy her reading.

Modified Prusa i3

No

Yes

0.2mm

20%

Print parts A & B and rotate so that they are flat.
Use stick-felt on the internals faces so that the phone and fingers fit snugly.
You will need to carve or sand down the join where they fit together so that they mate but tightly. No need for glue!

0.8 shell thickness

PLA @ 212 degress and 60 degree bed temp

Digital calipers
My wife's phone as a model
Google Sketchup
Cura for slicing and printing