Jump to content
UltiMaker Community of 3D Printing Experts

Question on print bed size settings


Recommended Posts

Posted · Question on print bed size settings

Greetings all,


I have an Ender 3 that I just upgraded to 300mm x 300mm with an ender xtender kit.  I went into machine settings and I adjusted the X and Y size settings to reflect the new size, but when I go to use Cura (4.7 ATM), it gives me 2 areas in which I cannot put any objects into without it saying that the object will not fit (see attached pic).  Is there a setting that I have missed, or will I need to create a new profile using a Custom FFF printer.


Thank you for your help


  • Link to post
    Share on other sites

    Posted · Question on print bed size settings

    I think this is what you need to do.

    Cura uses two machine definition files.  They should be in a folder that looks a lot like this:

    C:\Program Files\Ultimaker Cura 4.6\resources\definitions\

    One file is "creality_base.def.json" and the second is "creality_ender3.def.json"


    They are text files and will open in Notepad.  Within the Ender 3 definition file there might be an area like this (the numbers shown are for my E3Pro):

    Within the section  "overrides" find...

    "machine_disallowed_areas": {
                "default_value": [
                  [[-117.5, 117.5], [-117.5, 108], [117.5, 108], [117.5, 117.5]],
                  [[-117.5, -108], [-117.5, -117.5], [117.5, -117.5], [117.5, -108]]


    If it looked like the one below you would have a 10mm border around the 300mm build plate.  Don't quote me on that.  All I know about Python is that "if there are spaces, there are supposed to be spaces".

                   [[-150, 150], [-150, 140], [150, 140], [150, 150]],
                   [[-150, -140], [-150, -150], [150, -150], [150, -140]]

    Be careful and remember, if your printer blows up it wasn't my fault.  Make a backup copy of the file before you start changing anything.  When you restart Cura it should read the new numbers from the file.  I think.  Maybe.




  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now

    • Our picks

      • New here? Get ahead with a free onboarding course
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 14 replies
    • Create New...