3d Touch sensor : uneven auto level

[William]

Thanks for the sharing.

[JogiAUT]

Hi Guys,

i have exact the same Problem on my Prusa I3 Pro B from Geeetech. I bought the 3D-Touch-Sensor a few months ago. Yesterday i found some time to mount it on my printer. It takes me much time to bring everything back to working conditions.

BUT: Now i can´t use it. In two corners the nozzle is too high, in the other two corners the nozzle touches my glass on the printbed. The sensor is working, becaus it doesnt matter what i did with the printbed bevore. When i use the wingnuts and twist one corner deeper than the other one, the fault stays the same. 2 corners high, two corners low. (The same corners...everytime)

I have read the answer axenias got from geeetech exactly. (Difficult for me because my english is not good enough) But i can´t imagine, that this is the solution for our problem... I printed the holder from geeetech so the distances in X and Y should be the same.

In addition i tried the G29 with Repetierhost to monitor the Z-Positions in the corners. I did this a few times behind each other and got everytime different measurement results (without touching the printer to change something). The ratio of the deviation to one another is very similar (hundredths) but overall they are very different (sometimes 9 tenths, sometimes 1 tenth)

18:32:47.399 : Bed x: 30.00 y: 20.00 z: 1.95
18:32:56.698 : Bed x: 193.00 y: 20.00 z: 2.26
18:33:05.781 : Bed x: 193.00 y: 147.00 z: 2.56
18:33:15.476 : Bed x: 30.00 y: 147.00 z: 2.14

18:33:36.687 : Bed x: 30.00 y: 20.00 z: 1.85
18:33:45.986 : Bed x: 193.00 y: 20.00 z: 2.13
18:33:55.116 : Bed x: 193.00 y: 147.00 z: 2.38
18:34:04.752 : Bed x: 30.00 y: 147.00 z: 2.04

I am thankful for every answer becaus i am one step away from throwing the whole Printer out of my window...(Joke)
Greets Jogi

[William]

The two high corners and two low corners indicate the print bed is not level. And the 3d touch gets every Z value and then compensate the Z axis value when printing.
You should know the sensor is designed to finish the bed level: Auto Bed Leveling.

[JogiAUT]

Hello William,

thanks for your reply!

But isn,t the 3D-Touch for exactly this? To compensate, that the bed is not Level, based on the Z-Axis? The glass plate on the printer is even. I saw the video on the geeech webside, where they show us, how it works and this should be the same "problem" i have.

If i delete the G29 order from the G-Code and only left G28, it works very well. In all Corners the same difference to the nozzle.

[William]

Maybe your Z offset setting is not correct.You should set Z offset again.

[kromanao]

Hello!
I have exactly the same problem.
I have tried everything described here but nothing solves this problem.
I have marlin 1.1.6.
I already checked the offset, changed the glass (it is completely right), lined the table .... I do not know what to do anymore.
Have you been able to solve your problem?

[oryeth]

Hi @all,

same problem here since Firmware Marlin 1.1.5.

From 1.0.5 to 1.1.6 tried yellow and blue sensors without success.

Orderd original 3DTouch received yesterday.

Same problem. All sensors having this problem at left Glas-Bedside front area on original Geeetech i3 pro B.

Tried testing infos from this post -> no success @all.

Still @ Marlin 1.1.6.

My Settings (i´m shure, that these aree correct!) from Configuration.h:

.....
#define X_PROBE_OFFSET_FROM_EXTRUDER 6 // X offset: -left +right [of the nozzle]
#define Y_PROBE_OFFSET_FROM_EXTRUDER -43 // Y offset: -front +behind [the nozzle]
#define Z_PROBE_OFFSET_FROM_EXTRUDER -0.5 // Z offset: -below +above [the nozzle]
......
// If enabled, axes won't move below MIN_POS in response to movement commands.
#define MIN_SOFTWARE_ENDSTOPS
......
#define AUTO_BED_LEVELING_BILINEAR
......
// Set the number of grid points per dimension.
#define GRID_MAX_POINTS_X 3
#define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X

// Set the boundaries for probing (where the probe can reach).
#define LEFT_PROBE_BED_POSITION 30
#define RIGHT_PROBE_BED_POSITION 200
#define FRONT_PROBE_BED_POSITION 20
#define BACK_PROBE_BED_POSITION 147
.......

G28 and directly after Homing G29 T V4 resumes:

15:50:51.754 : G28
15:51:43.480 : X:94.00 Y:143.00 Z:10.50 E:0.00 Count X:7548 Y:11483 Z:26880
15:52:29.051 : G29 T V4
15:52:29.412 : G29 Auto Bed Leveling
15:52:44.629 : Bed X: 30.000 Y: 20.000 Z: -0.996
15:52:55.560 : Bed X: 115.000 Y: 20.000 Z: 0.029
15:53:06.499 : Bed X: 200.000 Y: 20.000 Z: 1.137
15:53:17.440 : Bed X: 200.000 Y: 83.000 Z: 1.321
15:53:29.470 : Bed X: 115.000 Y: 83.000 Z: 0.228
15:53:40.411 : Bed X: 30.000 Y: 83.000 Z: -0.867
15:53:51.352 : Bed X: 30.000 Y: 146.000 Z: -0.768
15:54:02.283 : Bed X: 115.000 Y: 146.000 Z: 0.295
15:54:13.222 : Bed X: 200.000 Y: 146.000 Z: 1.469
15:54:15.413 : Bilinear Leveling Grid:
15:54:15.413 : 0 1 2
15:54:15.413 : 0 -0.996 +0.029 +1.137
15:54:15.413 : 1 -0.867 +0.228 +1.321
15:54:15.413 : 2 -0.768 +0.295 +1.469
15:54:15.413 : X:194.00 Y:189.00 Z:9.11 E:0.00 Count X:15578 Y:15177 Z:26880


I´ll hope that i can find an solution at this thread.

[William]

I am currently using the Marlin 1.1.8 firmware to fix this error, maybe you should try this version of the firmware
Here is the post, thanks to the good guy.
http://geeetech.com/forum/viewtopic.php?p=81898#p81898

[oryeth]

Tried Firmware form your posted Link.

No success and having an Full LCD crashed Printer with this Firmware https://goo.gl/Sjf94u from post above.

After a couple of hours get printerboard GT2560 back working, but not Display (backscreen-lights on; blue shining, but blank).
(white PCB LCD).

Tried my backup firmwares from 1.0.5 till 1.1.7 without getting LCD back.

Copied Internet for searching to my hdd but didn´t find an successful solution bringing LCD back.

[William]

This firmware is for GT2560A+, you should refer to the 3D TOUCH user manual and change the correct value then upload it to your printer.