For the Ender 3 V2 (I assume it should work on ender 3 and pro, let me know if it is not) Wanted to make my own design just for fun, of an existing concept (ipired by the handle 2957507 and it's camera mount remix 3844371) I decided to go with the gopro type mount, because it is common. Exteion arms can be printed to adjust things to your own preferences. This has an exteive selection of extra arms 2194278 I printed vertically to reduce the amount of support (only touching bed), but that mea it is structurally less strong, but for the weight of a pi cam I don't think this is going to matter, and it does feels pretty sturdy enough for it's use case. Though printing flat will most likely create a stronger piece, but you'll need a lot more printed support. I don't know if it is strong enough for an actual gopro, regarding shakes during movement. I don't have one so can't test. It is just long enough to clear the print head (see picture, bed is fully moved to the far back), but if you have a gopro and it touches the print head, you can add an short extending arm that moves the camera further away (again found there: 2194278) I made a case for a raspberry pi camera (v1 or v2 but not the newer 12MP one, I don't have one), I will link it here once posted