This is my version of the Snowtrooper helmet from Star Wars: The Empire Strikes Back.
It comes in 3 pieces, the crown, skirt and mask. The drape cloth that is at the front and rear is not included, of course.
Crown 233.7 x 198.5 x 98.5 mmSkirt 233.0 x 229.5 x 166.2 mmMask 81.4 x 169.1 x 85.3 mm
If the parts are too big to fit on your printer, use AutoDesk MeshMixer or Microsoft 3D builder to subdivide. Both are free programs.
You will have to provide the cloth that drapes on the front and rear of the helmet. I'd recommend to use vinyl and super glue to attach, as epoxy may stain the material over time. Carefully cut the vinyl around the eyes to match the curvature. Use tinted plastic for the eye lenses and foam on the inside to fit your head.
Align the skirt to the crown by using the arrows.