okay people i noticed a big problem with using the origianl mkv helmet file and that there can be some serious warpage can happen so heres a model with supports but since it has open edges i suggest scaleing it to your helmet then print out only the supports
http://www.4shared.com/file/54294409/5c3aec57/mkv.html
http://www.4shared.com/file/54294409/5c3aec57/mkv.html