Let's take a look at the different Cardboard devices that are available. There's a lot of variety.
Obviously, the original Google design is actually made from cardboard. And manufacturers have followed suit, offering cardboard Cardboards directly to consumers—brands such as Unofficial Cardboard, DODOCase, and IAmCardboard were among the first.
Google provides the specifications and schematics free of charge (refer to https://www.google.com/get/cardboard/manufacturers/). For example, the Version 2.0 Viewer Body schematic is shown as follows:
The basic viewer design consists of an enclosure body, two lenses, and an input mechanism. The Works ...