Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5200810.

Here's my version of the Primaris helmet from Warhammer. It should be scaled the right size to fit a head, but because of the odd shape of the helmet it looks huge compared to other helmets(the cheekbones protrude in the face a lot so I had to scale the model up quite a bit to be able to fit a head in it),

Be sure to post a make if you print it and check out my other models.