Edit: 7/30/2017 If you downloaded these stl file before 7/30/17 you will need to get the updated files. These new files are labeled v3. There is a who...le in the model right above the breathing unit in the old stl files. I do check the files for whole before I post them but I missed this one and did not notice until I started printing. Sorry for any inconvenience.
This is a Boba Fett Concept Helmet designed by the late great Ralph McQuarrie. https://en.wikipedia.org/wiki/Ralph_McQuarrie
There are several different versions of this helmet so I based this one of a statue I found on the internet.
I would like to also thank all the people who helped me on my patreon page. They are the reason this helmet looks as awesome as it does. Thanks! https://www.patreon.com/user?u=4430621
This helmet is designed to fit an adult male but check the dimensions on the pdf file I uploaded. The units are in millimeter.