Random texture hex tile generator (sample code)

Some example code to demonstrate OpenSCAD's `rands()` function in a practical way. The preview won't work (there's a bug in the preview renderer when the `intersect()` function is used in 3D space) but every time you render the tile will be different. I've included a few example tiles that were generated at random. The sample tiles in the photos were printed using Eryone Hyper Speed Rock PLA (very useful for demonstrating layer-by-layer differences).

#### Recommended Print Settings
* 0.4mm nozzle
* 0.2mm layer height
* 10% infill
* No supports
* Print as oriented