Nice helmet. I just don't understand why in the one piece version, the pieces are 2 (just a little piece links the 2 pieces, and this piece broke immediately). Also, at the time of printing (last summer) the one piece version was the old one (without the room for ears) so it doesn't fit my head really well, and it hurts. Even the way to connect the pieces is somehow weird, but overall is a very well done model.
The print took about 22 hours. no major issues, except the upper part of the helmet, where the supports created a stringy and ugly surface. Nothing that i can't solve with a bit of sanding.