Maze ring generator

This is based on [Maze cylinder generator](http://www.thingiverse.com/thing:1229429). You may use MakerBot Customizer to generate the ring directly if you are not familiar with 3D modeling.

You may change the following parameters to generate a maze ring, a different maze every time.

- `wall_height`
- `wall_thickness`
- `cylinder_radius`
- `cylinder_height`
- `vertical_blocks`
- `horizontal_blocks`


Find all my mazes in the collection "[maze generators](http://www.thingiverse.com/JustinSDK/collections/maze-generator)".

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- *[OpenSCAD Documentation - Traditional Chinese](http://openhome.cc/Gossip/OpenSCAD/)*
- *[OpenSCAD Documentation - English](http://openhome.cc/eGossip/OpenSCAD/)*

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