Jump to content

Walls vs top and bottom layers

Recommended Posts

Posted · Walls vs top and bottom layers

When rotating a design for printing,  does it change what Cura considers the outer walls and top/bottom layers?  For example, if I take a box and rotate it on its side for printing, will the side of the box that now sits on the build plate, be considered the bottom layers by Cura?

  • Link to post
    Share on other sites

    Posted · Walls vs top and bottom layers
    4 hours ago, Rvalecruz said:

    will the side of the box that now sits on the build plate, be considered the bottom layers by Cura?



    Cura does multiple steps.  One of the early steps is to "slice" which means cura takes each of the layers and represents a plane and intersects that plane with all the triangles in the STL file (an STL file is an unordered collection of triangles - there is no information in there that says which triangle goes with which).  This is done *after* the rotation that you specified so the triangles are already rotated into their new postitions.


    At this point (for each slice) cura has a huge list of straight lines in 2 dimensional space (because we intersected with a plane.  Those randomly ordered lines are then linked up into loops.  The edges of those loops are considered the WALLS even if they are "holes" inside the part.  At the same time cura tries to figure out which side of these loops are inside versus outside.


    The TOP/BOTTOM areas are figured out differently - obviously everything printed in the very first slice is "bottom" but there can be "bottom" portions half way up the print as well.  TOP/BOTTOM is figured out in 3 dimensions.  Walls are figured out in a single 2 dimensional slice.

  • 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

      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 6 replies
    • Create New...