Quick-wind Kite String Holder

EDIT
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I added a new string holder that's got a string position retainer (holds string when deployed)

Original
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I made this because I find it a pain to have to wind up kite strings (or any string really). This should allow you to save some significant time.

I haven't printed it yet (my Robo3D Printer isn't here yet), and this is the first item I've made specifically for printing. Any feedback is greatly appreciated.

I'll probably upload a few more spin stick outers as I design them and test them (I did octagons to give a little grip).