New Hotend

Discussion in 'Troubleshooting' started by Jack1, Dec 22, 2017.

  1. Jack1

    Jack1 Member

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    I bought a new hot end because the original one got jammed, and the new one is a bit longer than the first. I have the code firmware pulled up and can successfully edit it, but I don't know how to change the height at witch the printer begins the auto-leveling. I remember it being something about configuration h, but I'm looking into it and can't find it. Also, when it is found, do I have to change it to anything specific or can I just raise it like 20cm?

    Any response appreciated,
    Thanks
     
  2. denys

    denys Active Member

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    have a look at this site...
    http://marlinfw.org/docs/configuration/configuration.html
    MarlinConfig1.jpg
    I think this may be it.
    If you measure the distance between the hot end and the platform and edit the number it should be ok.

    Having a look at mine, it is different from above...

    // Travel limits after homing (units are in mm)
    #define X_MIN_POS -DELTA_PRINTABLE_RADIUS
    #define Y_MIN_POS -DELTA_PRINTABLE_RADIUS
    #define Z_MIN_POS 0
    #define X_MAX_POS DELTA_PRINTABLE_RADIUS
    #define Y_MAX_POS DELTA_PRINTABLE_RADIUS
    #define Z_MAX_POS MANUAL_Z_HOME_POS


    there are some pre defined hotends...


    // The position of the homing switches
    #define MANUAL_HOME_POSITIONS // If defined, MANUAL_*_HOME_POS below will be used
    #define BED_CENTER_AT_0_0 // If defined, the center of the bed is at (X=0, Y=0)

    // Manual homing switch locations:
    // For deltabots this means top and center of the Cartesian print volume.
    #if ENABLED(MANUAL_HOME_POSITIONS)
    #define MANUAL_X_HOME_POS 0
    #define MANUAL_Y_HOME_POS 0
    //#define MANUAL_Z_HOME_POS 338.0 // For delta: Distance between nozzle and print surface after homing.
    // Original Deltaprintr J-Head setting
    //#define MANUAL_Z_HOME_POS 317.8 // E3Dv6 all metal hotend setting
    //#define MANUAL_Z_HOME_POS 302.4 // E3Dv6 all metal hotend + heated bed setting (standard FSR standoffs)
    #define MANUAL_Z_HOME_POS 313.6 // E3Dv6 all metal hotend + heated bed setting (modified FSR standoffs)
    #endif



    I didn't realize that when I changed my hot end so ind=stead I turned the hot end down to shorten it.


    ChineseHotEnd.jpg
     
    Last edited: Dec 22, 2017
  3. Jack1

    Jack1 Member

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    Thanks for your reply denys! The code you're referencing is in regards to what happens after the homing begins. What's happening with my printer is that it moving down and then hits the bed without stopping, the homing process doesn't start. I want to command the printer to begin the homing at a higher y value, and I don't know where I can do that. Also, looking furthur into this code, it seems as if Z is the axis going up/down and y and x are the axis going forward/backward/right/left. Am I right?

    Thanks
     
  4. denys

    denys Active Member

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    The code has a section to change to suit the hot end length.


    //#define MANUAL_Z_HOME_POS 338.0 // For delta: Distance between nozzle and print surface after homing.
    // Original Deltaprintr J-Head setting
    //#define MANUAL_Z_HOME_POS 317.8 // E3Dv6 all metal hotend setting
    //#define MANUAL_Z_HOME_POS 302.4 // E3Dv6 all metal hotend + heated bed setting (standard FSR standoffs)
    #define MANUAL_Z_HOME_POS 313.6 // E3Dv6 all metal hotend + heated bed setting (modified FSR standoffs)
    #endif

    Install your new hot end and measure the distance to the bed and add it there.

    Homing is when it runs to the top. Does your Deltaprntr run to the top switches first?
     
  5. Jack1

    Jack1 Member

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    Thank you so much! I though that the I got homing and auto-leveling mixed up. I had to change the distance drastically; the printer is now working!
     
  6. denys

    denys Active Member

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    That's great :)
    Have a good Christmas, print lots!
     
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