I have installed an inductive probe LJ12A3-4-Z/BX on a P3Steel Toolson MK2.
Had this before in Marlin. Easy setup.
Now I'm on Repetier Firmware 1.0.3 and facing some problems/questions. I used my current running Repetier config and just enabled z-probing and ABL.
I have read the z probing article many times but cleary I haven't understood half of it.
For clarification and to understand why I use a maybe weird offset, I'll roughly describe my current config:
Z_PROBE_X_OFFSET 30
Z_PROBE_Y_OFFSET 30
The probe is to the right side behind the nozzle.
Home X Y Z is outside of the printable area to the front left side, below the heated bed.
X home offset = -14
Y home offset = -24
Z home offset = 0
Z home offset was -0.43 when I had a mechanical endstop, before installing this inductive probe. Turns out to be a nightmare.
ENDSTOP(X|Y|Z)BACK_ON_HOME = 0;0;0
If I change these _BACK_ON_HOME coordinates to the printable area, the nozzle crashes full force into the side of the heated bed as it doesn't raise the Z axis before.)
ZHOME_PRE_RAISE = always
ZHOME_PRE_RAISE_DISTANCE = 10
HOMING_ORDER ="X,Y then Z".
QUESTIONS (2)
1. Adjust nozzle <-> bed distance when probe is triggered (HIGH)
I have mounted the probe roughly at the correct height. It has a 4mm trigger range. When I issue G30 the Z axis lowers until the probe is triggered. The nozzle is around 1mm above the bed. I KNOW THE METHOD OF USING A REFERENCE METAL PIECE and do some funky basic arithmetic. But honestly, I don't like it. To me it would be much easier to move the nozzle down on the Z axis manually with G1 -0.x until I can do the paper calibration. Yes, paper. Prehistoric. But I cannot move the Z axis below 0 even when there is a gap below.
QUESTION: How do I adjust in software the nozzle<-> bed distance when the Z-probe is triggered. Let's assume I cannot physically change the probe height. Z_PROBE_HEIGHT is already at 0.0.
Is this Z_PROBE_SWITCHING_DISTANCE?? No, cannot be....
2. When doing a "HOME ALL" I get following error:
Error:Activating z-probe would lead to forbidden xy position: -44.00000, -59.00
RequestStop:
fatal:Could not activate z-probe offset due to coordinate constraints -
result is inaccurate! - Printer stopped and heaters disabled due to this
error. Fix error and restart with M999.
M114 says= X:-14.00 Y:-24.00 Z:0.000 E:0.0000
In realitiy Z is more like Z:1.xxxxx (see question 1)
What I don't understand is where those two values come from: -44 -59.
-44 could be because of the x home offset =-14.
-14 -30 = -44
But -59 doesn't make any sense. I mean, -44 doesn't make any sense to me, too.
-24 -30 = -54. Not -59.
In other words: My Home position is outside of the printable area as all my endstops are outside. Z homes to Z min which is totally fine and no luck needed because I have set to home X,Y then Z. So no need to move up all the 200mm to an Z max endstop.
Some pictures.
https://imgur.com/a/wpMGqHU</div><div>On the mechanical side the homing with the probe works just like with the z endstop but it throws this error every time. The printer however doesn't care about this Fatal Software error and continous to home just fine. Although still 1mm+ above actual 0mm nozzle <-> bed distance.
This is my z-probe settings from firmware:
// #################### Z-Probing #####################
#define Z_PROBE_Z_OFFSET 0
#define Z_PROBE_Z_OFFSET_MODE 0
#define UI_BED_COATING 0
#define FEATURE_Z_PROBE 1
#define EXTRUDER_IS_Z_PROBE 0
#define Z_PROBE_DISABLE_HEATERS 0
#define Z_PROBE_BED_DISTANCE 10
#define Z_PROBE_PIN ORIG_Z_MIN_PIN
#define Z_PROBE_PULLUP 0
#define Z_PROBE_ON_HIGH 0
#define Z_PROBE_X_OFFSET 30
#define Z_PROBE_Y_OFFSET 30
#define Z_PROBE_WAIT_BEFORE_TEST 0
#define Z_PROBE_SPEED 2
#define Z_PROBE_XY_SPEED 150
#define Z_PROBE_SWITCHING_DISTANCE 1
#define Z_PROBE_REPETITIONS 3
#define Z_PROBE_USE_MEDIAN 0
#define Z_PROBE_HEIGHT 0
#define Z_PROBE_DELAY 0
#define Z_PROBE_START_SCRIPT ""
#define Z_PROBE_FINISHED_SCRIPT ""
#define Z_PROBE_RUN_AFTER_EVERY_PROBE ""
#define Z_PROBE_REQUIRES_HEATING 0
#define Z_PROBE_MIN_TEMPERATURE 150
#define FEATURE_AUTOLEVEL 1
#define FEATURE_SOFTWARE_LEVELING 0
#define Z_PROBE_X1 20
#define Z_PROBE_Y1 20
#define Z_PROBE_X2 160
#define Z_PROBE_Y2 20
#define Z_PROBE_X3 100
#define Z_PROBE_Y3 160
#define BED_LEVELING_METHOD 1
#define BED_CORRECTION_METHOD 0
#define BED_LEVELING_GRID_SIZE 3
#define BED_LEVELING_REPETITIONS 5
#define BED_MOTOR_1_X 0
#define BED_MOTOR_1_Y 0
#define BED_MOTOR_2_X 200
#define BED_MOTOR_2_Y 0
#define BED_MOTOR_3_X 100
#define BED_MOTOR_3_Y 200
#define BENDING_CORRECTION_A 0
#define BENDING_CORRECTION_B 0
#define BENDING_CORRECTION_C 0
#define FEATURE_AXISCOMP 0
#define AXISCOMP_TANXY 0
#define AXISCOMP_TANYZ 0
#define AXISCOMP_TANXZ 0
