Wall thickness of a surface

Discussion in 'General Discussion' started by robhare, Apr 24, 2013.

  1. robhare
    robhare New Member

    I draw my model in Rhino and use may surfaces instead of solids and export to .OBJ for uploading to MyShop.
    Just wondering , how does the printer treat wall thickness for surfaces ,will the thickness be ?
  2. AmLachDesigns
    AmLachDesigns Well-Known Member
    Not exactly sure what you are asking here.

    You must define your object exactly as you wish it to be printed. For example if your object is a cube (six faces connected by 12 edge, normals all pointing outward) you will get a solid cube. If you want a hollow cube you must define the internal surfaces (normals pointing inwards) and a hole (tunnel), connecting the two. The thickness of the walls will then be defined by you as the distance between the inner and outer surfaces. A face of a 3d model has no thickness of its own, it defines the boundary of an object.

    Think of it like this: the printers will do exactly what you ask them to, no more and no less. Shapeways will fix some problems with meshes, but not always in the way you hope or would expect, so it's better to get your mesh as you want it.

    Don't know if this helps or not, good luck!
  3. trishycakes
    trishycakes New Member
    I use Rhino as well. It will treat the space between two surfaces as a wall if it is a closed object. You will not be able to print it if it just a single surface that is not closed as it has no defined wall thickness.

    If you are concerned with wall thickness you can always use the command 'offsetsrf' which will allow you to offset that surface a determined amount. That is perfect for making exact wall thicknesses.