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You can use this for any USB dongle, I made it because the MX Ergo trackball mouse from Logitech didn't have any storage compartment. A few iterations were printed before getting the insertion force right, and it should probably work with any printer tolerances because of the little clips that locks into the USB connector.

Do not loose your Logitech Unifying USB dongle anymore with this print! Use a lighter to heat a little bit the MX ergo metal plate then use hot glue on the printed part. Do this with your dongle inside the holder.

Place it so the dongle inside the holder aligns with the end of the metal plate as shown in the pictures. Do not use too much glue.