One Piece Customizable Spool

The spool's width, diameter and spindle size can be customized but its main feature is it prints as a single part without needing any support.

*Updated:*
- Added a selection for a smaller spindle.
- Displays estimates for how much the spool can hold by weight and length.
- Performs some basic checks to make sure the spool designed can be printed.
- Does a better job at limiting the diagonal walls to a maximum of 45 degrees.