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This is my take on the Imperial Storm Commando Helmet as depicted in the Star Wars Legion artwork for 1:6 scale custom figures. These are scaled to match Hot Toys and Sideshow Star Wars figures.
The inside of the helmet has room for you to add whatever size socket/joint you require to adapt it for your figures.
This comes in two versions: standard (short top) that more closely matches the artwork and a taller top version that IMHO makes it look better and is a bit more practical looking.
These are STL format intended for resin printing. Some modification will be needed for them to fit your chosen 1:6 figures neck post. These are not designed to have a head fit insode though may be something I do in future.