Who need a Bondtech BMG when you can put a 3:1 ratio step motor from Triangle Lab? : r/prusa3d
I just installed the Bondtech DDX and it says I need to change my e steps to 415 and says nothing about calibration, but my calculated value is a lot off that,
Bondtech Mini Geared (BMG™) Extruder for groove mount E3D Hotends
BondTech Extruder BMG right - 3DJake International