This is a clip for the Motorola smart stylus, that uses a very small feature to clamp into the pocket at the end of the stylus. Print orientation is critical for strength and the ring keeps the clamp tight with a dab of superglue giving us about 4mm^2 of plastic in shear. (The stylus is only 6g) https://cad.onshape.com/documents/53d76af87f25a591d4ce52d9/w/ab1c94c17f9734aca9e50be9/e/fe98d991d5249a89cc578a02?renderMode=0&uiState=693a26130920c0c0dd3bafc1