I was having a bit of trouble printing the Phase II Clone helmet by @Hippig. I needed to scale it a bit smaller (91%) to fit lego heads but the cheek pads got too thin to print well. So I remixed it keeping the 91% scale and filling the helmet to turn it into a stand alone lego head. After which it prints out quite nicely in helmet opening side down with the added bonus of making it printable with no supports.

I am building a set of lego heads so that my kids can try playing Star Wars Legion using lego figures as they are approximately the same scale.

https://www.printables.com/social/90982-ian-foulds/collections/394300