Upgraded your lens to a 5.4mm lens from ragecam?
Heres a ring you slip around the lens so you can focus it on the fly.
2 sizes, small one so that it fits inside a gopro lens filter attachment, large one so when naked, you can focus.
printed 100% infill.
when done, first focus to distant object then click the ring all the way in so that there is no gap between the lip and the lenshousing.
now all you do is loosen the ring (left turn) to focus close.