Robo3D Lead Screw Upgrade - Quick Printing Hole Cover

I added the Lead Screw upgrade to my Robo3D R1 and then found I had this hole exposing the screw connected to the motor. I was afraid little pieces of plastic can fly in there and damage something.

I wanted a solution but I didn't want to take everything apart to implement in.

So I came up with this quick printing hole cover (3 min max) that is easy to slide on the screw without messing with the thread.