This is a bumper for the mouse so you don't accidentally hit a button while moving because you bump into something on your desk.
You can now use the original srew to mount the bumper (in my case TX5)
Instead of using the original screw, you can also use a USB-C connector to attach it. Simply cut from an old cable, or you can use the usb lid to mount the bumper, but this is not as stable as an original USB-C connector.
I recommend to print with ASA or PETG.
The author marked this model as their own original creation.