I made a 3D file to have a zoom gear for my Panasonic 7-14mm lens printed and figured I'd share it here. It's for a Nauticam housing. Fit on the lens is a bit tight and it seems to be a little on the longer side, but it works as is. If you have a 3D printer or know someone with one, it's a good way to save money over buying from Nauticam.
https://www.thingiverse.com/thing:2500699
