RP9v2 Fan Mount

This is a simple fan mount for the [BobsCNC](http://www.bobscnc.com) RP9 printer incorporating a 50mm x 15mm radial cooling fan. The duct is printable in 2 pieces, the carriage mount and the duct. The duct will need support for the connector. The pieces should attach nicely with some superglue/hot glue. The finished assembly should replace the upper most piece of wood on the carriage, so no extra hardware is need.

I decided to use a radial fan because they produce an considerable amount of airflow while still staying relatively quiet. Here is a [link](https://www.amazon.com/gp/product/B00MJU6JR2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1) to the fan I purchased ($8):


#####Wiring
To wire the fan to the RP9 (or any printer using Ramps 1.4) simply snip off the plastic connector at the end of the fan wires, extend the wires (I soldered on two longer wires), and attach to the D9 and corresponding + terminal on the Ramps 1.4 board ( red wire connects to the + terminal).

#####Usi