Hey, yeah there is always one who already did it
Yes, it is direct driven without any gear between the stepper and the filament. The "knurles bolt" (or better: the drive gear) is directly mounted on the stepper - just like the UM2 feeder.
What do you mean by "reduce the motion and increase the torque"?
If you buy the new stepper motor, the torque is high enough and in addition you really need the new one because of the higher resolution (0.9° instead of 1.8°). I tried to print something in high quality with the stock-stepper, but the surface was way too rough.
You could also put again a gear between the stepper and the knurled bolt in order to increase the actual resolution and torque at the filament, but if you do so, it would be nearly the same as the original feeder: you cannot directly use new types of drive gears (like the mk8) and more/faster moving parts lead to more noise in general.
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zumfab 3
Very nice, I have been thinking about doing almost exactly this. Judging by the pictures this is a direct drive feeder, right? Might it not be more beneficial to make a kind of hybrid which reduces the motion and increases the torque?
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