NOTE: THIS IS NOT GUARANTEED TO PROTECT AGAINST WATER. USE AT YOUR OWN RISK. NOT RESPONSIBLE FOR DAMAGED CAMERAS IF THIS GASKET FAILS.
This is a gasket sealing ring for the HTC Re camera. The camera itself is already waterproof, but HTC sells a "protection pack" for $25 that adds a rubber gasket to the bottom of the camera to further protect against water and allow the camera to go deeper underwater. I didn't feel like paying 25 bucks for the official gasket, so I made one! This one is made with TPU filament and includes a vertical piece that inserts into the microUSB port for even more protection. Place this ring into the camera, then tightly screw on the original (or replacement) bottom cap to get a nice, tight seal.
Take a look at HTC's official gasket for comparison: https://www.htc.com/us/accessories-b/#!pid=re-camera&acc=re-protection-pack
Thanks to nickleyw for the microUSB piece design.
Print with TPU for the best seal. Highly recommend printing slowly (30mm/s or less) with a flow/extrusion of rate 105% or so. This should result in the best possible seal against water.