Motor Steps/mm configuration

bebbbo

Hello,

I have a Prusa i3 R2 with Motech motors Nema 17 1.8° 4,4kg, Ramps 1.4, Drivers DRV8825, belt GT2 step 2mm, pulley with 20 tooth.

In repetier firmware i used tihs configuration:

#define XAXIS_STEPS_PER_MM 80

#define YAXIS_STEPS_PER_MM 80

#define ZAXIS_STEPS_PER_MM 3200

and also

#define X_MAX_LENGTH 200

#define Y_MAX_LENGTH 200

#define Z_MAX_LENGTH 210

#define X_MIN_POS 0

#define Y_MIN_POS 0

#define Z_MIN_POS 0

(a friend with the same hardware sent me this configuration and it works properly with his printer).

Using repetier calculator, the numbers should be ok (80) for X and Y.

I launched Repetier host and I clicked on HOME-X button and the extruder went correctly on the left side to the endstop and stopped setting the point X=0.

Then i clicked on the X button to move to the right side with number 50 for 4 times and the extruder reached the center of the X axis instead of the end and the X coordinate is X=200 and it's wrong because it's in the middle instead of the end of te right side.

If I click more than 4 times on X button the extruder doesnt't move on right side (I think because in the configuration I have correctly #define X_MAX_LENGTH 200 and it think to be at X=200 instead of X=100).

Why it happens?

80 steps should be te right number with my hardware.

Thank you,

Roberto

Repetier

Check steps per mm defined in eeprom. If that matches remove stepper driver and see if you have set the right microstepping there.

bebbbo

This is what I see if I use Gcode M 205 and it seems to be OK...

19:21:19.573 : EPR:0 1028 4 Language

19:21:19.578 : EPR:2 75 115200 Baudrate

19:21:19.582 : EPR:3 129 0.000 Filament printed [m]

19:21:19.582 : EPR:2 125 0 Printer active [s]

19:21:19.586 : EPR:2 79 0 Max. inactive time [ms,0=off]

19:21:19.591 : EPR:2 83 360000 Stop stepper after inactivity [ms,0=off]

19:21:19.593 : EPR:3 3 80.0000 X-axis steps per mm

19:21:19.599 : EPR:3 7 80.0000 Y-axis steps per mm

19:21:19.604 : EPR:3 11 3200.0000 Z-axis steps per mm

19:21:19.608 : EPR:3 15 200.000 X-axis max. feedrate [mm/s]

19:21:19.610 : EPR:3 19 200.000 Y-axis max. feedrate [mm/s]

19:21:19.610 : EPR:3 23 2.000 Z-axis max. feedrate [mm/s]

19:21:19.615 : EPR:3 27 40.000 X-axis homing feedrate [mm/s]

19:21:19.619 : EPR:3 31 40.000 Y-axis homing feedrate [mm/s]

19:21:19.623 : EPR:3 35 2.000 Z-axis homing feedrate [mm/s]

19:21:19.627 : EPR:3 39 20.000 Max. jerk [mm/s]

19:21:19.632 : EPR:3 47 0.300 Max. Z-jerk [mm/s]

19:21:19.632 : EPR:3 133 0.000 X min pos [mm]

19:21:19.634 : EPR:3 137 0.000 Y min pos [mm]

19:21:19.638 : EPR:3 141 0.000 Z min pos [mm]

19:21:19.645 : EPR:3 145 200.000 X max length [mm]

19:21:19.645 : EPR:3 149 200.000 Y max length [mm]

19:21:19.647 : EPR:3 153 210.000 Z max length [mm]

19:21:19.651 : EPR:3 51 1000.000 X-axis acceleration [mm/s²]

19:21:19.656 : EPR:3 55 1000.000 Y-axis acceleration [mm/s²]

19:21:19.660 : EPR:3 59 100.000 Z-axis acceleration [mm/s²]

19:21:19.664 : EPR:3 63 1000.000 X-axis travel acceleration [mm/s²]

19:21:19.668 : EPR:3 67 1000.000 Y-axis travel acceleration [mm/s²]

19:21:19.673 : EPR:3 71 100.000 Z-axis travel acceleration [mm/s²]

19:21:19.675 : EPR:3 1024 0.000 Coating thickness [mm]

19:21:19.679 : EPR:0 880 0 Autolevel active (1/0)

19:21:19.686 : EPR:0 106 0 Bed Heat Manager [0-3]

19:21:19.688 : EPR:0 107 255 Bed PID drive max

19:21:19.688 : EPR:0 124 80 Bed PID drive min

19:21:19.692 : EPR:3 108 196.000 Bed PID P-gain

19:21:19.697 : EPR:3 112 33.000 Bed PID I-gain

19:21:19.697 : EPR:3 116 290.000 Bed PID D-gain

19:21:19.701 : EPR:0 120 255 Bed PID max value [0-255]

19:21:19.706 : EPR:0 1020 0 Enable retraction conversion [0/1]

19:21:19.710 : EPR:3 992 3.000 Retraction length [mm]

19:21:19.712 : EPR:3 1000 40.000 Retraction speed [mm/s]

19:21:19.716 : EPR:3 1004 0.000 Retraction z-lift [mm]

19:21:19.721 : EPR:3 1008 0.000 Extra extrusion on undo retract [mm]

19:21:19.725 : EPR:3 1016 20.000 Retraction undo speed

19:21:19.729 : EPR:3 200 620.000 Extr.1 steps per mm

19:21:19.729 : EPR:3 204 50.000 Extr.1 max. feedrate [mm/s]

19:21:19.734 : EPR:3 208 20.000 Extr.1 start feedrate [mm/s]

19:21:19.738 : EPR:3 212 5000.000 Extr.1 acceleration [mm/s²]

19:21:19.742 : EPR:0 216 3 Extr.1 heat manager [0-3]

19:21:19.747 : EPR:0 217 230 Extr.1 PID drive max

19:21:19.751 : EPR:0 245 40 Extr.1 PID drive min

19:21:19.753 : EPR:3 218 7.0000 Extr.1 PID P-gain/dead-time

19:21:19.753 : EPR:3 222 2.0000 Extr.1 PID I-gain

19:21:19.757 : EPR:3 226 40.0000 Extr.1 PID D-gain

19:21:19.762 : EPR:0 230 255 Extr.1 PID max value [0-255]

19:21:19.767 : EPR:2 231 0 Extr.1 X-offset [steps]

19:21:19.771 : EPR:2 235 0 Extr.1 Y-offset [steps]

19:21:19.771 : EPR:2 290 0 Extr.1 Z-offset [steps]

19:21:19.776 : EPR:1 239 1 Extr.1 temp. stabilize time [s]

19:21:19.782 : EPR:1 250 150 Extr.1 temp. for retraction when heating [C]

19:21:19.786 : EPR:1 252 0 Extr.1 distance to retract when heating [mm]

19:21:19.791 : EPR:0 254 255 Extr.1 extruder cooler speed [0-255]

Repetier

Yes it is set to 80 steps per mm, but you driver is set to 32 substepping I guess. So increase to 160 or change microstepping to 16.

bebbbo

Ok, now it works (thank you) but I have another problem...

As you can see the Z max lenght is 210 but it stops at Z=100 and I don't understand the reason.

sns5400

How you can see thad substepping =32

Repetier

@sns5400 you can conclude from theoretical resultion to measured, or you check the substepping pins of your driver and read what that pin combination has as substepping.

@bebbbo Assuming your steps per mm are correct that makes in deed no sense. What does M114 report there and what does M119 say? Maybe z max end stop triggered?