For my final project in my 3D printing class, I created a model of an Imperial Storm Commando helmet based on the 2009 Hasbro Star Wars Evolutions pack Storm Commando action figure. The final model I created was a Lego helmet, but I do not intend to share that model here simply because I want that one for personal or authorized use only. This model is a scaled up version that does not feature the hollow area where a minifigure head would go. If you would like to purchase one of the Lego helmets feel free to message me and we might be able to work something out.
Learn more about this model here: http://3dprinting.illustratingmath.com/2019/12/13/lego-imperial-storm-commando-helmet/