Remix of https://www.thingiverse.com/thing:2874659/files by SirRob - tried to post as a remix but thingiverse won't let me

Love the orginal design, just added a tip to save myself finding and mounting the bearing ball, and figured others might want to do the same. Still works fine witrh a plastic tip, though im sure not as well as it would on a ball.

Printing with the tip on requires supports, but i blocked the supports inside the air channels as they arent needed there.