This helmet was completely designed in Fusion 360. I tried to make it as historically correct as i could.. I didn't print it myself yet, so it is still untested. Check the sizing before you print it and definitely post pics if you do!
Happy Printing! :)
Update 21.10.18 (v2): I adjusted the cheek plates so they actually sit on the cheeks and i designed another slimmer crest including the mount..