Prints without support in the orientation provided. The contact area on the build plate is very small so you will want to print with a raft. I used a 3mm raft.

Two protrusions fit in the mounting holes on a 120mm case fan with the intent to hid cables in a PC build. It is loose fitting so if you want to install these below a top fan, you should either use adhesive or you can modify this with slightly larger pegs to fit snug. Or ask me and I'll do it.