Parametric Magnetic Driver Bit Handle (derivative)

This is a derivative of JoeyC's awesome thing:34852. Much of this is his wording + my respectful commentary. All I did was add a cavity in the handle to store my extra bits. I also added an end cap.

Fully configurable magnetic handle for 1/4" driver bits.

(JoeyC intended it for driver bits. From the picture you can see I'm using mine for drill bits, which I use to clean out and dress up small holes in my printing.)

JoeyC couldn't find a handle he liked for some metric driver bits, so