I would like to calculate the amount of steps to turn the motor to have 1 mm of the filament.
I did the following (using approximate values):
The gear on the outside of the teeth as a diameter of 11mm. Therefore the circumference is 34.56mm. Divided into one degree i get 0.096mm / degree. The stepper does 1.8 degree per step which results in 0.1728mm per step.
To get 1mm of filament pushed into the extruder I will have to do 5.787 steps.
The same extruder is in a Geeetech i3. The firmware there is configured to do 93 steps per millimeter.
I don't have any experience in working with stepper motors but in theory, this would be my approach with a huge difference to an existing firmware.
Where is my mistake?