3D Google Cardboard kit is optimized in 3D printing. He is very ways unencumbered and easy to manufacture and assemble. Lens diameter of 25 mm.
https://www.youtube.com/watch?t=1&v=uzJ-a_K3tdc
Rafts: No
Supports: No
Infill: 0,15
Notes:
The time print all details about 5 hours.