I just swapped it for the extruder one and I have the very same problem.
From this we can assume it's either a bad marlin configuration, a badly calibrated stepper driver or a problem with RAMPS 1.4 (or every motor has the same problem but I found that very improbable).
I'd appreciate if someone with a Prusa I3 (RAMPS 1.4 + A4988) post his Marlin configuration to start discarding issues.
Thanks.
From this we can assume it's either a bad marlin configuration, a badly calibrated stepper driver or a problem with RAMPS 1.4 (or every motor has the same problem but I found that very improbable).
I'd appreciate if someone with a Prusa I3 (RAMPS 1.4 + A4988) post his Marlin configuration to start discarding issues.
Thanks.