Tau Fire Warrior Shoulder Guards
It appears to be from the Dawn of War game. I have smoothed and unfold it, so it's ready to go...please check you paper settings as i have done this in A4.
I would love to give credit to the guy that rip these files but I don't remember who it was! But I'm sure it was someone from 405th.
Tyvern I've only tried one of your files, when I converted it it has few open faces and edges. I using Metasequoia to edit the files after exporting from Sketchup