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R2 - nozzle crashes on the printbed

Discussion in 'Troubleshooting' started by PT156, Feb 16, 2019.

  1. PT156

    PT156 New Member

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    Dear Robo3d Community,
    I am facing the following problem on my Robo R2 printer:
    During the calibration routine of the Z, the first points are done correctly (the nozzle stops about one centimeter from the printbed) then on the 4th point (always the same, the first of the second line) the nozzle crashes on the printbed (the printbed do not stop at one cm from the nozzle as it should)

    The IR height sensor (Z) seems to work, the red light comes on when approaching an object.
    I cleaned this sensor, the problem remains.
    I changed this sensor, the problem remains.
    I checked that all the cables are correctly connected.
    I cleaned the nozzle, the problem remains.
    I restart the printer, the problem remains.
    I disassembled and assembled again the printbed, the problem remains.

    Printbed V2 installed,& the printer software is up to date.

    Can you help me ? Do you already had this problem ?

    Thank you

    Paul (from France), please be lenient for my poor english :))
     
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  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  3. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    I have no answer because I do not use the bed calibration wizard since it doesn't work when using Marlin 1.1.9
     
  4. Geof

    Geof Volunteer Moderator
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    Im sure you have, but have you cleaned the bed. Also please copy and paste your start up scripts here for us to look at
     
  5. PT156

    PT156 New Member

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    Thanks for your answers. I have cleaned the bed, and ordered a new builtak sheet to see if it's better
    Scripts:
    before prints job starts:
    ; set to millimeters
    G21
    ; set to absolute mode
    G90
    ; zero extruder
    G92 E0
    ; turn off fans
    M107
    ;non blocking heatup of extruder and bed
    M104 S230
    M140 S60
    ; Robo Leveling
    G36
    ; pause for 2 seconds
    G4 S2
    ; move bed down 15mm
    G1 Z15 F300
    ; move to front left corner
    G1 X10 Y1 F7200
    ; heat to priming line temp
    M109 S230
    M140 S60
    ; move bed to printing position
    G1 Z0.3
    ; print 190mm priming line
    G1 X190 E15.0 F500
    ; move bed down
    G1 Z15 F300
    ; zero extruder
    G92 E0
    ; set movement speed
    G1 F7200

    After job complete:
    ; turn off heaters
    M104 S0
    M140 S0
    ; turn off fans
    M107
    ; move bed down 10mm
    G91
    G1 Z10
    G90
    ; home XY axis
    G28 X0 Y0
    ; home bed
    G28 Z0
    ; set absolute mode
    G90
    ; zero extruder
    G92 E0
    ; turn off motors
    M84

    After print job is cancelled:
    ; turn off heaters
    M104 S0
    M140 S0
    ; turn off fans
    M107
    ; move bed down 10mm
    G91
    G1 Z10
    G90
    ; home XY axis
    G28 X0 Y0
    ; home bed
    G28 Z0
    ; set absolute mode
    G90
    ; zero extruder
    G92 E0
    ; turn off motors
    M84

    After print job is paused:
    G1 Z{{ pause_position.z + 30 }}

    Before print job is resumed:
    G1 Z{{ pause_position.z }}
     
  6. Geof

    Geof Volunteer Moderator
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    for funsies, remove the G36, add:

    G28 ; home all axis
    G29 ; Auto level dance


    I'm curious to see if the problem goes away (The G36 is robo code that I personally dont love- I've seen some have success using the G28/G29- me I remove the G36 add a G28 and manually level- no issues)
     
    #6 Geof, Feb 19, 2019
    Last edited: Feb 19, 2019
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    you can just comment a line out by adding a ";" to the beginning of the line
     
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  8. BLKFLD

    BLKFLD New Member

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    Old Topic but some print surfaces don't trigger the IR sensor. I use blue build plate sheets most of the time. I switched today to an Overture Build plate and my bed crashed into the extruder until I started using bits of masking tape to trigger the sensor. FYI not worth the hassle. Overture build plates are going into the trash like they usually do.
     
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  9. Yopz3d

    Yopz3d New Member

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    Hey just curious as I've had the ir sensor issue now since I updated to the flex plate, I tried a few of the suggested fixes but thought I would confirm, is this blue masking tape specifically to trigger the ir sensor. And do I still need to remove the line of gcode? It's got 2.0.0-r2.6 on it.


    Sent from my iPhone using Tapatalk
     
  10. BLKFLD

    BLKFLD New Member

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    I don’t know about your code modifications.

    I usually run sheets of blue tape (Amazon) to help with bed adhesion. I received a free build surface from overture (amazon) and it worked well. I ran out of the free overture build sheets so I ordered the ones they sold on Amazon.

    They are different than the free ones (measuring grid motif), the dimensions are slightly different and they have a ridiculous space theme that has non uniform colors, center is brighter than the edges.

    My first attempt to print resulted in Z axis crash. Reboot, tried a Z offset calibration (little weird, there is a z dip in the middle of the bed for some reason) anyway, looked good enough. Sent the print job and crash again. Did this like three times and noticed that it was always crashing while probing the middle of the bed. I put some blue tape there and it worked as normal. I thought that was dumb.

    What build surface were you using prior to flex plate? Follow the extruder around with the gap tool paper card thing and see if it triggers the IR. See if you can make it through the probe sequence using your old build surface.

    Sorry I don’t have more technical advice for you, good luck.
     

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