Hexagon and Alu-Extruder Carriage for DaVinci 2.0

Same rules apply as my first attempt 2 years ago, only less plastic, better cooling and less ugly!

Just as the title says: You can now rid yourself of that awful, stock, hotend / extruder combo! I've created this part specifically for RepRapDiscount's Hexagon Hotend and Printrbot's Aluminum Extruder. Plus, with its unique "Clip-On" design, you no longer have to dismantle your entire printer to replace, maintain or modify your carriage.

I have now put 50+ hours on the carrier, so far only