Auto Bed Levelling Isn't correcting Enough

Hello, i build a „normal“ 3d Printer (no Delta) and have trouble with the auto bed levelling.

First I’m using a wood Bed with Double-sided adhesive tape without bed levelling. That works more or less fine for the first test runs.

Now I buy a proper bed with blue Tape on it and enable auto bed levelling and attached a reflection light sensor to the Z-Axis. After that a reflection Laser sensor and then a normal switch.

Then I’m using  

M321

M322

G28

G0 X124 Y167 Z30

G32

M320 S2

At the end, the Z-Axis is moving wen the X- and Y-Axis are moving.so far so good now I have the issue that the Z-Axis is not moving enough.

On the 4 corners the high is perfect, but on the middle of the bed, the nozzle is over 0.5mm to high.

 

My Bed is ok but the Y-Axis has Construction-related a curve J

Now the question what can I still do?

 

extra information:

this is my first forum post on English so Excuses this.

 Repetier-Firmware 1.0.0dev

Repetier-Host V1.6.2

Data from eprom:

X-axisstepspermm         :              400.000

Y-axisstepspermm         :              400.000

Z-axisstepspermm         :              3.948.148

X-axismax.feedrate[mm/s]       :              200.000

Y-axismax.feedrate[mm/s]        :              200.000

Z-axismax.feedrate[mm/s]        :              15.000

X-axishomingfeedrate[mm/s]  :              40.000

Y-axishomingfeedrate[mm/s]  :              40.000

Z-axishomingfeedrate[mm/s]  :              10.000

Max.jerk[mm/s]             :              20.000

Max.Z-jerk[mm/s]         :              0.712

Xminpos[mm]  :              0.000

Yminpos[mm]   :              0.000

Zminpos[mm]   :              0.000

Xmaxlength[mm]           :              300.000

Ymaxlength[mm]            :              300.000

Zmaxlength[mm]            :              355.690

X-axisacceleration[mm/s^2]      :              1.000.000

Y-axisacceleration[mm/s^2]      :              1.000.000

Z-axisacceleration[mm/s^2]      :              100.000

X-axistravelacceleration[mm/s^2]          :              1.000.000

Y-axistravelacceleration[mm/s^2]          :              1.000.000

Z-axistravelacceleration[mm/s^2]          :              100.000

Coatingthickness[mm] :              0.000

Z-probeheight[mm]      :              5.000

Max.z-probe-beddist.[mm]       :              10.000

Z-probespeed[mm/s]   :              3.000

Z-probex-y-speed[mm/s]          :              160.000

Z-probeoffsetx[mm]     :              31.000

Z-probeoffsety[mm]     :              30.000

Z-probeX1[mm]              :              31.000

Z-probeY1[mm]               :              31.000

Z-probeX2[mm]              :              260.000

Z-probeY2[mm]               :              31.000

Z-probeX3[mm]              :              31.000

Z-probeY3[mm]               :              260.000

Z-probebendingcorrectionA[mm]          :              0.000

Z-probebendingcorrectionB[mm]           :              0.000

Z-probebendingcorrectionC[mm]           :              0.000

Autolevelactive(1/0)     :              1

Enableretractionconversion[0/1]            :              0

Retractionlength[mm]  :              0.000

Retractionspeed[mm/s]              :              40.000

Retractionz-lift[mm]      :              0.000

Extraextrusiononundoretract[mm]        :              0.000

Retractionundospeed   :              20.000

Comments

  • edited March 2017
    G32 levelling is if your bed is 'flat'. it seems like you have a concave bed where the centre is lower than the corners,
    for this type of levelling you need to use G33  mesh levelling.

  • Thangs for that advice.

    After enabling distortion correction and correcting the x and y coordinates on my Printer´s firmware hi is testing the grid and give me some output on the console, but when I move the x and y Axes the Z Axes do´s nothing.

    21:18:05.367 : Z correction disabled

    21:18:05.371 : Reference Z for measurement:15.000

    21:18:13.325 : X:0.00 Y:0.00 Z:0.000 E:0.0000

    21:18:30.810 : Z-probe:36.582 X:30.00 Y:290.00

    21:18:43.675 : Z-probe:35.346 X:95.00 Y:290.00

    21:18:56.553 : Z-probe:35.386 X:160.00 Y:290.00

    21:19:09.406 : Z-probe:35.310 X:225.00 Y:290.00

    21:19:22.164 : Z-probe:35.090 X:290.00 Y:290.00

    21:19:36.999 : Z-probe:37.109 X:30.00 Y:225.00

    21:19:50.479 : Z-probe:36.881 X:95.00 Y:225.00

    21:20:03.913 : Z-probe:36.767 X:160.00 Y:225.00

    21:20:17.282 : Z-probe:36.615 X:225.00 Y:225.00

    21:20:30.593 : Z-probe:36.463 X:290.00 Y:225.00

    21:20:45.572 : Z-probe:37.466 X:30.00 Y:160.00

    21:20:59.215 : Z-probe:37.291 X:95.00 Y:160.00

    21:21:12.821 : Z-probe:37.205 X:160.00 Y:160.00

    21:21:26.398 : Z-probe:37.121 X:225.00 Y:160.00

    21:21:39.935 : Z-probe:37.028 X:290.00 Y:160.00

    21:21:54.873 : Z-probe:37.372 X:30.00 Y:95.00

    21:22:08.500 : Z-probe:37.253 X:95.00 Y:95.00

    21:22:22.114 : Z-probe:37.220 X:160.00 Y:95.00

    21:22:35.712 : Z-probe:37.177 X:225.00 Y:95.00

    21:22:49.290 : Z-probe:37.126 X:290.00 Y:95.00

    21:23:04.097 : Z-probe:37.043 X:30.00 Y:30.00

    21:23:17.629 : Z-probe:37.015 X:95.00 Y:30.00

    21:23:31.141 : Z-probe:36.964 X:160.00 Y:30.00

    21:23:44.653 : Z-probe:36.972 X:225.00 Y:30.00

    21:23:58.162 : Z-probe:36.952 X:290.00 Y:30.00

    21:23:58.956 : Info:Distortion correction matrix:

    21:23:58.960 : -8521, -8033, -8049, -8019, -7932

    21:23:58.965 : -8729, -8639, -8594, -8534, -8474

    21:23:58.969 : -8870, -8801, -8767, -8734, -8697

    21:23:58.969 : -8833, -8786, -8773, -8756, -8736

    21:23:58.973 : -8703, -8692, -8672, -8675, -8667

    21:23:58.977 : G33 X30.00 Y30.00 Z-22.043

    21:23:58.977 : G33 X30.00 Y95.00 Z-22.373

    21:23:58.981 : G33 X30.00 Y160.00 Z-22.466

    21:23:58.981 : G33 X30.00 Y225.00 Z-22.109

    21:23:58.985 : G33 X30.00 Y290.00 Z-21.582

    21:23:58.989 : G33 X95.00 Y30.00 Z-22.015

    21:23:58.989 : G33 X95.00 Y95.00 Z-22.253

    21:23:58.993 : G33 X95.00 Y160.00 Z-22.291

    21:23:58.993 : G33 X95.00 Y225.00 Z-21.881

    21:23:58.997 : G33 X95.00 Y290.00 Z-20.346

    21:23:59.001 : G33 X160.00 Y30.00 Z-21.965

    21:23:59.001 : G33 X160.00 Y95.00 Z-22.221

    21:23:59.006 : G33 X160.00 Y160.00 Z-22.205

    21:23:59.006 : G33 X160.00 Y225.00 Z-21.767

    21:23:59.010 : G33 X160.00 Y290.00 Z-20.387

    21:23:59.014 : G33 X225.00 Y30.00 Z-21.972

    21:23:59.014 : G33 X225.00 Y95.00 Z-22.177

    21:23:59.018 : G33 X225.00 Y160.00 Z-22.122

    21:23:59.022 : G33 X225.00 Y225.00 Z-21.615

    21:23:59.022 : G33 X225.00 Y290.00 Z-20.311

    21:23:59.026 : G33 X290.00 Y30.00 Z-21.952

    21:23:59.026 : G33 X290.00 Y95.00 Z-22.127

    21:23:59.030 : G33 X290.00 Y160.00 Z-22.028

    21:23:59.034 : G33 X290.00 Y225.00 Z-21.463

    21:23:59.034 : G33 X290.00 Y290.00 Z-20.090

    21:23:59.038 : Z correction enabled

  • aaaaaah sorry.

    If you set the DISTORTION_END_HEIGHT at 0 it is normal that hi is do´s nothin.


    Now it is working just fine. thank you again for the help.

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