This is a clip that will snap fit on the side of the Mk 4 frame. It has 2 studs that fit some custom mounting holes for my Rpi Zero Mounting Back Cover.
The Stud on the inside in the clip is added to sit inside the hexagonal grooves on the frame in case the clip loosens over time.
I Printed with supports on build plate.
As I was for unknown reasons unable to upload the STL, here is a link to the onshape file:
The author marked this model as their own original creation.