Customizable Escalator v2

Revised version of http://www.thingiverse.com/thing:1884080
The chassis is now a lot less bulky and consists of multiple parts, the pulleys move more easily now.

Before printing everything it is best to print a couple chain links to see if they work. When using multiple links per step the chain link with the socket on top can be used to connect both the horizontal and vertical parts of one step, the link without the socket can be used in between. The pulley should be big enough that the chai