Vemico 4K sport cam lens cover

Based on [CallJoe](https://www.thingiverse.com/CallJoe/about)'s glowing review of the very inexpensive Vemico 4K action camera, I picked one up for printing time-lapses.
It does a great job.
I'm using it without the waterproof enclosure, but I wanted to protect the protruding lens while its hanging around in the shop.

This lens cap prints in one piece without supports. There is a small groove for an O-ring to hold it in place. I created the seal with a simple strip of 2mm craft foam.