Edit 5/23/17 : Please do not print version 1 of the helmet (v1). The "fin" was too thin at the top and will not print out well. Version 2 of the helmet (v2) will print out the fin better. Also the fin just looks better in version 2.
This is Dr Fate's Helmet (Helmet of Fate). This helmet was designed by the Lord of Order Nabu. So thanks Mr Nabu from providing the design.
This helmet was sized to fit an adult male but check the pdf file for dimensions. the unbits are in millimeters.