OpenY Carriage

- Much Much Lighter
- Easier to assemble
- Many Fewer screws/nuts/washers
- No Squashed frog
- Can be attached/removed without removing the Y rails
- Easily adaptable and reconfigurable

Designed with similar goals to the OpenX project:
http://www.thingiverse.com/thing:6278

Note: the assembled rendering is not exactly the same as all of the separate parts combined, but i already had it on my desktop so that's the one i uploaded. I'll upload a correct one later, but the design is largely the same, with just minor differences.