CNC Workholding Clamp Customizable

Inspired by https://www.thingiverse.com/thing:4283960, but I needed more customizations and more rigidity. The clamp should provide both down clamping force and some side support.

Tips:

- Print as designed (flat face down)
- Print with a lot of walls, the main goal is rigidity along the long axis for clamping force

## Dimensioning

Please see the diagram for the dimensions available in the OpenSCAD customizer.

The main features you will want to customize, are:
- workpieceHeight, depending on your workpiece, default is 6mm
- slotLength to make the clamp longer or shorter, depending on your spoilboard and needs
- slotWidth depending on your screw size

Based on your changes, you may need to change some things, either to provide rigidity or preserve a working shape. There are automatic checks which disable the model if you have features too close to the ground.