Ender 3 BMG Carriage Mount Adapter for Pancake Stepper Direct Drive Speed Drive
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Adapter to mount the BMG to the Ender 3 style carriage for better weight distribution and speeds in direct drive setup.
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This is a redrawn remix of the original Speed Drive to accept a 20mm pancake stepper and not hit the extrusions (so you don't have to mess with the endstops and lose printable space) and to align the extruder to the hotend below. I always liked the Speed Drive style because of the creator's goals:
- Orientation of the motor (shaft) should be perpendicular to the X extrusion for good absorption of rotational inertia.
- The motor's centre of mass should be as close as possible to the middle of the X extrusion for absorption of its significant linear inertia at speed.
It attaches directly to the aluminum spacers / bushings of the V rollers behind the plate and I've also added a taller arm for wire management. This way, the weight distribution is excellent, and it should work better with higher speeds than the traditional sideways mounted BMG you usually see that sits lower on the carriage.
While it can print in either front or back orientations, the large flat base will make contact with your carriage, so it's best to have it flat on the bed for printing. It will unfortunately require supports, so I hope yours are well tuned, since it's printed in PETG and the middle part can be a little tough to remove.
I use it with the Mosquito NF Crazy and Fang models, which you can find in my other 3D Models. If you use the same mounting kit, the PTFE tube required for the BMG + Mosquito NF Crazy is about 53mm.