So, the first thing you need when making a Cardboard VR headset is… well, cardboard! It would also be nice to know how to cut and fold this cardboard. That’s why I created two template files: one A4-sized template and a letter-sized version. You can download the files down below.
At the time of creating this template I was an active member of the OnePlus community and my daily driver was a OnePlus One. I used my phone to test and modify the template until I was satisfied with the results.