Here's a 3D-printed lens CAP for the Insta360 One R (360 edition)

(360 lens cap) 3D print ready STL file download link

http://medelis.se/3D%20models/Medelis%203D/Insta360oneR%20%20360%20edition%20cap.stl

STL file not for resale (NFR)

Print at Home or Work for use