If you have regular 60º coffee filter paper, you can fold it a few different ways to achieve the 80º angle for brewing with the UFO Dripper. While all folding methods are suitable, you might notice slight differences in flow rate depending on the method you choose. If you're keen to pick up filters that are already compatible with the UFO Dripper, you'll want to consider either the SIBARIST - UFO | Speciality Coffee Paper Filters or UFO - Paper Filter Type A.
And with that, let's get folding! In the below video, Ply walks through the 60º -> 80º filter folds:
Here's a closer look at making the folds that Ply describes: