Please use short (4mm) m3 inserts on the case to attach the clip on with m3x8mm screws. The bottom corner of the case is open so its easier to push the echo mini out of the case.
The screw holes at the back are spaced 24mm apart so make any attachments you want for it!
I will say that printing the clip out of pla will likely give you the best results for clamping
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