Solar controller cable holder

This is a cable holder for solar charger/controllers. It reliefs the cable tension from the terminals allowing a safer and more reliable long term operation.

## Features
- Diameter of the holes can be customized by changing variables in FreeCAD
- Includes a drilling guide for the screw holes - you don't want to damage any electronic component
- Prints without supports
- Recommended fasteners: 4.2mm x 13mm wafer head, metal self tapping screws