I designed this model as a simple stand for devices such as e-readers, tablets and smartphones. It is easy to print and doesn't use a lot of filament. 

Fits 3 devices up to 13mm in thickness.

Print instructions:

Supports: No (just don't print it on it's side)

Material: Whatever you like (PLA is probably easiest)

Layer Height: 0.2 - 0.28mm

Infill: 10 - 20%

Shells: 3 - 4