Parametric Rounded 9 volt Battery Holder

*Remixed from the [9-Volt Battery Holder -- Customizable](https://www.thingiverse.com/thing:3030592) by [ConfusedPrinter](https://www.thingiverse.com/confusedprinter/designs).*
Added rounded corners where appropriate and "9 V" labels: left, center and right.
Since the model **MUST** be printed with support I added a support blocker to cover all the embossed text (*since they do not need any support to print properly*)!