A 3D printable virtual reality headset that uses your smartphone. inspired by the popular Google cardboard VR headset. this version was designed after my cardboard started falling apart (RIP). It uses two 25mm diameter 40mm focal length bi-convex lenses (sold on Amazon) to focus on SBS (side by side) 3D video and apps from your smart phone. Features: Rubber band hooks to attach your smartphone. Finger access ports to tap your screen when wearing the device. Snap fit lens covers Two head mounting options (see instructions). You will need: -Two 25mm diameter 40mm focal length bi-convex lenses (same used with Google cardboard). -Two rubber bands. Optional: -A GroPro head strap with mounting screw -Or elastic material to make a head strap. Assembly: