K6-3 Helmet as seen in PUBG

Level 3 helmet from PUBG

I've printed one of these myself, but be warned the helmet might not fit your head, the
interior width of the helmet is 173mm. You may also want to glue some sort of fabric/cushion to the top so it will be more comfortable.

When printing the visor i'd suggest either flipping it 90 degrees forward, if not you may want to increase layer resolution to avoid ugly steps.