Parametric Plug / Cap / Stopper

I designed this specifically for a cheap set of hex drivers with small, hollow handles. I carry some of these cheap drivers in my quadcopter backpack, and putting a plug in the end lets me store appropriate spare screws inside the handle of each driver.

I figured I may as well make it a Customizer, so whatever circular hole you might need to plug, you ought to be able to make this TPU plug/cap/stopped in the correct size!