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Marlin 2.0.x sensorless probing and probes variables

Posted by biskero 
Marlin 2.0.x sensorless probing and probes variables
October 23, 2019 12:13PM
Hello,

I am configuring Marlin 2.0.x with sensorless probing which works fine.
I have set Marlin 2.0.x on a SKR Pro v1.1 with TMC 2209 for a dual pellet extruder custom printer.

Now for bed leveling I will consider the nozzle of E0 as the actual probe?
For example I would need to change the following?

#define NOZZLE_TO_PROBE_OFFSET {10,10,0}

to

#define NOZZLE_TO_PROBE_OFFSET {0,0,0}

or these variables are ignored for sensorless probing?
Anything else I need to consider?

thx

Edited 1 time(s). Last edit at 10/23/2019 12:17PM by biskero.
Re: Marlin 2.0.x sensorless probing and probes variables
October 23, 2019 01:45PM
If you want to use sensorless homing on Z and run the nozzle into the bed then yes, the X and Y probe offsets would be 0.

However, I would highly discourage you from trying to use sensorless homing on Z. Because the Z axis usually uses leadscrews and has a lot of torque, getting sensorless homing to work reliably on Z is very difficult - you need to set a very low threshold which introduces noise.
Re: Marlin 2.0.x sensorless probing and probes variables
October 23, 2019 01:52PM
Hello,

ok great will set it t o 0,0,0.
I have it already working and as you said the sensitivity variable was tricky to find.
Here is a video.

Thx
Re: Marlin 2.0.x sensorless probing and probes variables
November 04, 2019 06:08AM
Hello,

trying to figure out all the variables settings for the sensorless probing.
I got the nozzle to be used as a probe on my SKR Pro v1.1 with TMC 2209, but I am not clear how to set the various variables available in the Z-Probe options of Marlin 2.0.x configuration.h, I set the following:


#define NOZZLE_TO_PROBE_OFFSET { 0, 0, 0 }
// Certain types of probes need to stay away from edges
#define MIN_PROBE_EDGE 50

#define Z_CLEARANCE_DEPLOY_PROBE 1 // Z Clearance for Deploy/Stow
#define Z_CLEARANCE_BETWEEN_PROBES 10 // Z Clearance between probe points
#define Z_CLEARANCE_MULTI_PROBE 10 // Z Clearance between multiple probes
#define Z_AFTER_PROBING 10 // Z position after probing is done

#define Z_PROBE_LOW_POINT 0 // Farthest distance below the trigger-point to go before stopping

// For M851 give a range for adjusting the Z probe offset
#define Z_PROBE_OFFSET_RANGE_MIN -10
#define Z_PROBE_OFFSET_RANGE_MAX 10



So the behavior of the probe/nozzle is that it goes around 1mm below the bed, I test this with a piece of wood and I see the marking of the nozzle.

Any suggestions?
thx

Edited 1 time(s). Last edit at 11/04/2019 06:08AM by biskero.
Re: Marlin 2.0.x sensorless probing and probes variables
November 04, 2019 09:40AM
After testing with the above configuration I got some strange results.
Basically I did bed leveling from the screen and the carriage moved from x,y,z 0,0,0 to x,y,z 650,50,20
even though the log says x,y,z 0,50,20 ,is like x did not move ???

I know is 650 because x moved all the way to the end of the bed.

But that's it, it did not do anything else even if I set to do a BILINEAR bed leveling with 12 GRID points.

Doing G29 Q and M420 V got the following result after doing the bed leveling:
( I know the grid with 12 points is too big and I already changed to 4)

>>> G29 Q
SENDING:G29 Q
current_position= X0.00 Y50.00 Z20.00 : >>> G29
Machine Type: Cartesian
Probe: NONE
Probe Offset X0.00 Y0.00 Z2.00 (Aligned With & Above Nozzle)
Auto Bed Leveling: BILINEAR
(disabled)
>>> M420 V
SENDING:M420 V
Bilinear Leveling Grid:
0 1 2 3 4 5 6 7 8 9 10 11
0 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
1 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
2 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
3 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
4 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
5 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
6 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
7 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
8 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
9 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
10 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
11 ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
echo:Bed Leveling OFF
echo:Fade Height OFF

config files

Here is a video

Edited 3 time(s). Last edit at 11/05/2019 06:48AM by biskero.
Attachments:
open | download - log.txt (3.2 KB)
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