Simple Cable Spool

Using instructions:
1) Insert the middle of the cable in the shaft on the "inner" part
2) Place the "outer" part over the shaft
3) Secure using the "clip" part. Hold the shaft firmly rather then just pushing in since the stress on the part can break it at the layer lines. You may want to remove any elephant foots from the clip to allow it to slide in smoothly.
4) Wind the "inner" part to retract the cable.
5) Pull the cable to extend it

See the model in action:
https://www.youtube.com/watch?v=gr08-VtrzRw
Cool video made by another maker:
https://www.youtube.com/watch?v=MDxgWJDzl1M

Model can be scaled to fit different kinds of cable sizes. No supports needed and the parts are pre-oriented.