weird calibration issues with modified Itty Bitty single extruder
I swapped out to a Itty Bitty but did not like how insanely hot it got. I thought I might have another go at it but with a different setup. I modified the design a bit and am using a 104 tooth big gear and an 18 tooth gear on the stepper. My thought was to give it more torque. It isn't getting hot but I cannot get it calibrated!
I am at 905 for steps/mm and when I call for 50mm it extrudes 45mm or so. I then raise it up to 910 and it over extrudes so I go to 908, it extrudes 45.5mm of ABS. I raise it up again and it under extrudes. I keep this up till eventually I am back at 910 and it is still under extruding!
I am chasing this number all over the place and I cannot get it to work out consistently! Am I up against a limit of the firmware?