I need help with bed autoleveling and Y axis

Hello

I am new in 3D printing and I have a problem with Y axis when autoleveling bed
I am using Tevo Tarantula (large bed, MKS 1.0 board) with SN04 (green) sensor for Z axis and Marlin 1.1.x bugfix (easyconfig)
When choose autolevel (linear, 9 points) from display, everything is ok until autolevel reaches the last line of 3 measuring points
Bed is going too much in front, touching the end of rail and making a noise 1-2 secons (belt slipping over the motor teeth)
After that autolevel goes ok, measuring the remaining 3 points

In configuration.h I chose large bed (200/280), sensor offset (right 20/front 15), bed margin (5)
I tried with bed (200/260)
nothing changed, it does the same

I did something wrong?

Besides that the printer works relatively ok, autohome works ok
I still have to set the Z-offset, but that's the next question

Thanks

Attach your configuration.h File to a google drive and post link here,

Will have a look for you.

here is configuration.f file

Where does home place the nozzle, It should be about center the bed? YES

Is it possible to move the nozzle out of the bed area? NO

If your answers match mine. I would try the line below
#define BED_MARGIN 15

Roxy-3D commented on May 7, 2017

Linear assumes the print bed is perfectly flat, but slightly tilted. It does either a 3-point probe to define that tilted plane or it does a grid of probes and uses a Least Squares Fit to determine the plane.

Bi-Linear assumes the bed is not flat. It is basically a Mesh Bed Leveling system. Each mesh point can have a different height that describes its Z position. In side any given mesh cell, it does a bi-linear interpolation of the 4 corner mesh points to determine the correction applied to the nozzle.

I would have chosen Bi-Linear as you can save the Bi-Linear Bed Leveling mesh!

#define BILINEAR

[forums.reprap.org]

Thank you for quick answer

Nozzle home place is not right the middle, is more in the front, I think is like in the middle of a 200x200 bed type (mine in 200x280, large one)
No, can't move the nozzle out of the bed area.

I will try you settings.

After running autoleveling, should I "Store to memory" ? (from LCD panel)

I save the results of bed leveling, when I see a print starting to lay the layers incorrectly. In the beginning you may want to save Bed leveling once at the beginning of each days printing.
Then after a while you will save the bed leveling one a week, Bi-weekly or myself only when I see the 1st layer start printing wrong.

You can also save this print by quickly adjusting the babystepping Z-Axis to correct the layer error. If you have a skirt of 2 lines or so.
After Storing bed leveling you will need to add "M420 S1 ; Bed leveling on", I add this after the last G92 in the Startup G-Code

Sample of my startup G-Code last 6 lines

M117 My Print...
G28 X0 Y0
G1 E4.0 ;prime extruder
G92 E0 ;reset extruder length
M420 S1 ; Bed Leveling On
M220 S32.000000 ; Set start print speed ; I change this Using Cura Tweak at Z (Height of layer 2)(New speed 72)

Edited 1 time(s). Last edit at 05/18/2018 10:28AM by Roberts_Clif.

so I tried with the margin margin 15 and did the same
then I tried 25 and then did not touch the end of the Y rail
this is probably the right setting
but in the front, the bed margin in about 35-0 mm

I changed to the #DEFINE bilinear and nothing changed in measuring the 9 points
there are probably some different calculations in the back

thank you again for your help
maybe you can still help me because I'm somehow lost

The SN04-N was my first Proximity sensor - did not like the size it would hit both T-Slot frames on Z-Axis.
On the Y-Axis it was 65mm behind the nozzle. I upgraded to the TL-W3MC2 (purchased lot of 5 for less than single sensor price).
Now the Sensor is 20mm directly behind the nozzle. Could redesign the adjustable slide mount and move it closer if needed.




Will do my best to help! As I am still learning this new innovated 3D technology myself, often I have to ask for help from the 3D Forums.

Edited 6 time(s). Last edit at 05/18/2018 04:15PM by Roberts_Clif.