I've made a more updated model, which is more accurate and detailed, https://www.thingiverse.com/thing:4942061
Here's my attempt at the Phase 2 Clone Helmet from Star Wars. I based this off of the ATotC and RoTS clone helmets(modeled in fusion 360 and Microsoft 3d builder). The inside of the helmet is very rough and blocky, so if you want to wear this you'll need to add padding or sand it smooth. Just use the exploded image for the placement of all the details, you'll need 2 ear greebles, 2 vent details and one chin detail. Scale it 515% to get it around scale with most clone helmets and you may need to split it into multiple pieces to print if you have a smaller printer. I'll have assembly and painting instructions up soon. The model named clonehelmetwhole.stl is the whole helmet with the greebles attached to it, clonehelmet1.stl is the helmet with out the greebles on it so you can print them separately for better resolution.

Be sure to post a make and check out my other models.