MBS COMPACT DIRECT DRIVE

Design goals:
- Balanced distribution of mass. Trying my best to make it not too tall and not too wide.
- Let the center of mass close enough to the axis.
- Make sure BMG and V6 are attached - no PTFE tube in between.
- Use 4020 fan for lowering the noise.
- Compatible with original E3d V6 30mm fan duct.
- Wire goes backward to make sure it can reach full 250mm z axis height.
- Minimizing material usage to lower the total weight.

Installation:
- Extruder nozzle has a 10mm Y offset from the original ender-3 nozzle because of BMG's design. There are two ways to fix it
- Reduce the Y axis size by 10mm, which might slightly reduce your print bed size.
- Or, you may put two new holes on 40×40 aluminum extrusion for the Y-axis base and move it by 20mm. Then by adjusting the Y endstop you will get full Y axis length.
- You will need a slightly longer screw to hold the stepper motor and BMG together. Or you may just drill screw holes a little deeper on the BMG.
- There a