This adapter allows you to use any standard 52mm filter on your GoPro Hero 3 lens (without the waterproof case). It simply presses on the lens (snug fit but I would not use it for extreme sports as it might come loose) and screw in your favorite 52mm filter. The filter I have shown on mine is a blue filter but probably most popular would be a polarized filter.This item will require support. I would recommend a .35mm nozzle or smaller and .2mm layer height or smaller. It can be a little tricky to screw in the filter as there are no threads in the adapter but it will go in, I got mine started then just pushed it in. It's a tight fit but it will work.