Printed with OEM PLA with rafts and supports. I found this necessary because the bottom of the helmet is actually convex (or concave depending which way you view it). What this means is it initially prints in there points, like a tripod. The front two portions are printed vertically, at an angle, and it's very fragile and prone to get detached or knocked over by the inactive extruder (in my case).
I think filament temp was 205C and bed temp (Buildtak-type) was 55-60C.