My Prusa Mendal has been out of commission for a long, long while and I finally traced the problem down to some weirdness in the electronics (Sanguinololu). So I replaced it with RAMPS. Setup has been pretty smooth, and the X/Y axis seem to be working well, but I'm getting strange behavior on the z-axis.
First of all, it moves much, much slower than I recall being normal. Secondly, when clicking the +10 in Pronterface 5 times, it only raises about 5mm.
At first I thought is was my steps per mm setting in Marlin, but what I have seems like it should be pretty close:
//// MOVEMENT SETTINGS
#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {50*60, 50*60, 4*60, 0} // set the homing speeds (mm/min)
// default settings
#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,200,2267.717,1380} // Metric Prusa Mendel with Makergear geared stepper extruder
#define DEFAULT_MAX_FEEDRATE {500, 500, 5, 25} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {9000,9000,100,10000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot.
#define DEFAULT_ACCELERATION 3000 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 3000 // X, Y, Z and E max acceleration in mm/s^2 for retracts
I have 5/16" - 18 threaded rod, 200-step steppers, and the three jumpers on the RAMPs board setting stepping to 1/6th.
Any idea on what's going on or what to check?
Thanks.
