Jump to content
Ultimaker Community of 3D Printing Experts

Walls vs top and bottom layers


Rvalecruz
 Share

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?

    Yes.

     

    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
     Share

    • Our picks

      • New here? Get ahead with a free onboarding course
        Hi,
         
        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
        • 8 replies
    ×
    ×
    • Create New...