Maybe in this topic: https://forum.fairphone.com/t/fairphone2-3d-printed-casings-available-beta/11614
Paul beat me to it.
First post (scroll to top of page) I say: “I will be logging some stuff here and here”
One ‘here’ refers to this page, the other is a link to what you are looking for.
Maybe a good idea for you to read the rest of that post (and rest of topic) too 