Customizable hex driver handle

This is yet another hex driver handle. This one is customizable.

Adjust the tolerance to fit your printer. The tolerance works with 0.35mm layers on my printer's 0.4mm nozzle, with the driver being designed to be removable. If you want a permanent mount, reduce the tolerance, and push driver in while plastic is hot.

Uses (and bundles) my [tube mesh](https://www.thingiverse.com/thing:2406760) and [Bezier](https://www.thingiverse.com/thing:2207518) libraries.

No supports or brim needed. PLA recommended for rigidity.

**Updates:**

- March 20, 2020: Added one or more levers for leverage.