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Ultimaker Original, non standard Z screw


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Posted · Ultimaker Original, non standard Z screw

Ancient printer, maybe not something that is fixable anymore.  But if there IS a fix, I think it is here.


I started out with this UMO second hand, already highly modified.  I made a change to add quiet drivers and, although mostly happy with them, I don't think the firmware load needed for them is playing nice with the non-standard Z screw and its stepper motor.  I'd like to be able to change the steps. 


I use the excellent bUltimaker tool.  While this allows me to specify the GT2 pulleys (and so takes care of the steps for x and y), I don't see an option to tweak Z.


Is there a way to alter the Z steps as needed?     I'm not afraid of programming as needed, of course depending on the platform.


Thanks in advance for your thoughts.


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    Posted · Ultimaker Original, non standard Z screw

    You could ask the creator of the bUltimaker tool to add those settings to his tool.
    Otherwise, you'll have to compile the firmware yourself. It's not difficult when you have some software experience as it is a standard Arduino environment.


    The setting is in the file Marlin/Configuration.h

    I'm pointing to the repository with the bUltimaker fork as that seems to have the most features.


    #ifdef ULTIMAKER_HBK
    #define DEFAULT_AXIS_STEPS_PER_UNIT   {XY_STEPS,XY_STEPS,200.0,760*1.1}  // default steps per unit for Ultimaker
    #define DEFAULT_MAX_FEEDRATE          {500, 500, 30, 25}    // (mm/sec)
    #define DEFAULT_AXIS_STEPS_PER_UNIT   {XY_STEPS,XY_STEPS,200.0*8/3,760*1.1}  // default steps per unit for Ultimaker
    #define DEFAULT_MAX_FEEDRATE          {500, 500, 5, 25}    // (mm/sec)

    Step values are for X, Y, Z & E respectively

    HBK is to be defined for printers with the 'Ultimaker heated bed kit' only. 
    When you have an Original+, then it already includes the heated bed and this define should _not_ be set.

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    Posted · Ultimaker Original, non standard Z screw

    Thank you!  I missed the fact that this could be done in an Arduino IDE.  I was reluctant to bother the author but you're right to suggest it. 


    Probably not the last question I'll ask as I stumble through this.  Thanks for getting me pointed in the right direction.



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