Edit 5/28/17 : I missed uploading part 1 and 2. They are there now. Sorry.
This is the Thor Ragnarok Helmet with the wing rotator bar. The helmet was... slightly modified to use the rotator bar. The previous version helmet will not work with these wings.
Part 16 might be too big for your print bed. If this part is too big just print parts 20 and 22 instead. part 20 and 22 is part 16 split in two.
This helmet is was sized for an adult male but check dimensions on pdf file. units are in millimeters.