The original sticks on the Boxer killed my thumbs (thumber). I've played games my entire life, so I wanted something closer to that. The original wider version is about the same size as an xbox stick end and the second is narrowed down. I print these in TPU. They won't screw onto the stick in other materials and they don't feel as good in any other material. I have three lengths of each type.

0.2mm layer height
TPU