Soldering Wire Spool Holder

I thought I'd throw my hat in the ring with a base to hold soldering wire. I know there are a zillion of these on Thingiverse, but I wanted some things:

1. To practice modeling things in [Onshape](http://onshape.com).
2. Magnets! Looking at the models around, I figured the thing would slide around while I was pulling solder out of it. So I built it to fit [the 1/2" x 1/8" nickel-plated neodymium magnets](http://www.mcmaster.com/#5862k969/=x6lxm0) I have.
3. Multiple spools! This is design