This is an adapter for the GRR Neo to mount a lefthanded Bondtech BMG as a direct drive extruder onto Kakadu's ingenious Reprap Neo e3d v6 hotend upgrade ( https://www.thingiverse.com/thing:971035 )
In addition to one printout of each part you will need:
1x M3x16 screw for screwing the two pieces of the adapter_extruder together
3x M3x25 screw and
3x M3 hexagon nut for mounting adapter_extruder onto the base
2 M4x10 screws for the filament guide
a small piece of bowden (a little more if you use the E3D v6 lite)
a Bondtech BMG lefthanded extruder
a small sized NEMA 17 stepper (I took one with 42x42x20mm from https://www.omc-stepperonline.com/nema-17-bipolar-18deg-13ncm-184ozin-1a-35v-42x42x20mm-4-wires-17hs08-1004s.html?search=42x42x2 )
enough cable to connect the stepper
Assembly should be pretty straightforward, I hope. You need to take care about the bowden length though; it has to protrude ca. 6mm into the extruder, so do not cut it off flat to the surface of the adapter.
At least on my printer, this upgrade did wonders to print quality relative to the original bowden design. Happy printing!
I suggest 4-5 perimeters and top/bottom layers for maximum stability