Inflatable Pool Cap and Plug

This Thing is a replacement plug and cap for the large inflate/deflate port of a big inflatable kids pool. It has two parts:

* A plug that pushes inside the large inflate/deflate port ("inflatable pool plug.stl")

* A cap that screws on over the plug ("inflatable pool cap round smoother.stl")

The cap part is a remix of [Inflatable Pool Cap](https://www.thingiverse.com/thing:26493) by [jag](https://www.thingiverse.com/jag/about). Thanks to the publishing of the openscad source for that Thing, it was a simple tweak to change to a round exterior (instead of hex) and set more stepsPerTurn / $fn for higher resolution curves on the threads. (I chose 120 steps per turn instead of the default of 24 steps per turn, which gave a little smoother result given the overall size of the part.)

A shout out as well to [syvwlch](https://www.thingiverse.com/syvwlch/about) for developing the awesome and useful [screw library](https://www.thingiverse.com/thing:8793). That library makes the thread