Solves the following problems:
- mounted horizontally to improve clearance
- prevents motor collision on left side at 0mm X above ~50mm Z
- now only collides frame on right if you go past 160mm X and above 90mm Z
- hot end now centered in carriage
- can now be removed from carriage without having to dissasemble first
- makes it look like a miniature version of Adrian's extruder (hey it's a feature to me!)