Marble Run

After seeing Ferjerez making a marble run using Processing.org, I thought I'd give it a go in OpenSCAD. Obviously heavily inspired by his work.

Fernando's thing: https://www.thingiverse.com/thing:4203859
And a his nice set of mazes for download - https://cults3d.com/en/3d-model/game/procedural-marble-maze-full-set

Set for 5mm diameter marbles (well, steel balls). Scaling up for larger marbles should work fine.

This is very much a work in progress.

The maze is defined as an array in the OpenSCAD file - it doesn't generate mazes, just creates the model from an already-defined maze. See Ferjerez's writeup linked from his model.

Be aware it's not the quickest model for OpenSCAD to render. I've not marked it as a customizer as I suspect it's way too heavy duty.

In addition to the all-in-one STL for the marble run itself, I've generated separate components which can be assembled for multi-material prints. I've not actually printed it multi-material, as it was going to spen