Prussian styled spike helmet. It should be wearable if scaled to the right dimensions, though I worry that the inside walls might be a bit thick. Feel free to modify as needed.
Printers: Creality 3D Ender-2
Design Programs: Fusion 360, Blender, Meshmixer
Slicer: Simplify3D, Cura
If you like my work,I also have a large number of free models available on Thingiverse -