This will help keep spooled wire in its place. Just pull it off to get to the wire, and snap it back in place when you're finished. There's a window so you can see what's underneath, and a little pull tab you can stick a label on.

Compatible with customizer, and fully parametric.

Choose some values in the "User-defined values" section if necessary, render, and print. The default values fit a typical wire spool found at Radio Shack.