Anet A8 Titan Aero carriage & fan duct

I remixed this great extruder carriage from [ade2](https://www.thingiverse.com/ade2) to fit my Anet A8. I really like the way you can see the nozzle without lots of stuff in the way. The sensor is also nice and close to the nozzle and you can get access to the hobbed gear easily if it gets clogged or flexible filament gets kinked

I did make some tweaks to the design. I changed the rods of the X axis so they are the distance apart as the stock Anet A8 X axis. I am using a [Chinese clone of the