Direct E3D v6 extruder for Mega Zero (Ender 3)

I realized the need to switch to using a direct extruder. But most DIY designs are bulky, while I desired something more compact and sleek. There are two ideas which have made this possible:

1. *First,* I adopted a rotated motor design, inspired by a motor placement on an Anycubic Kobra Pro 2. This not only reduced the size but also shifted the mass center closer to the belt attachment point.

2. *Secondly,* the extruder radiator fan blow air outward instead of onto the radiator.

Having been limited in space, I had doubts about the efficiency of conventional cooling, as hot air would not escape an enclosure. Thus, I sum up with the enclosure which intakes air through the hole in the carriage plate and inflates hot air in front. It will not damage your fan as the air is not hot, but warm. I have already had 12 hours prints on 245C, and it works even better than expected.

##Manufacturing
During prototyping, I printed the plate with ABS and found that it was not rigid enough