It is designed to fit an average human head but as with every helmet stl file out there i suggest you double check it before printing.

I used a 3d scan of my head when making the model so it should fit on 100% for many people. As always i do advise to double check the scale when printing it , and since there is not logical way to split the helmet/cowl , you can just use plane cut or cut in the prusa slicer if you need it :

Meshmixer tutorialhttps://www.youtube.com/watch?v=0iwApSDx4oc&

Prusa slicer tutorialhttps://www.youtube.com/watch?v=RSvb-HGrFWE

There are options with combined and removable eyes in case you want a display piece and not a wearable one

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