I edited the original model to printthis helmet with the least amount of support. I added some bevels to eliminate overhangs and flattened the inside of the helmet so as to make a bridge that didn't require supports. The only support present is for the right ear. As shown in the photo, the orange parts need to be eliminated: the support at eye level could be a little difficult to remove, you could help yourself with a dremel.

The accessories are in the other .3mf file and are made with sequential printing to drastically reduce the number of purges, so don't be scared if you print one component at a time.

Before starting to print the helmet, check if your head fits well printing the dimension test

Helmet visor: https://www.amazon.it/gp/product/B078YYQVWN/ref=ox_sc_saved_image_10?smid=A3R2BN8GAL312Z&psc=1

If you don't want to spend money for this item, you can print your own visor (in the profiles list), but the result could not be perfect.