I used a similar type camera mount on the MK3, but the clearances of that one did not work on the MK4 so I designed a new one that doesn't wrap around the bar and instead locks into the hex pattern on the back of the frame.  A camera can be attached with a standard camera mount screw.

There are two variants here, one that is just for a camera one one with space to attach a sticky-back led strip to provide lighting for the camera.

Prints without supports.