Random maze container generator

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

You may change the following parameters to generate a maze container, 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.