\n
Modeling Each Part as a Triangular Mesh<\/h3>\n
As mentioned above, STL files describe the 3D model of your part as a collection of interconnected triangles. Analogously, the triangles are built up and linked together like tiles on a floor or shingles on a roof \u2013 except it\u2019s a far more complex form of tessellation.<\/p>\n
If you picture the way 3D printers deposit materials, you can maybe imagine why a structure of triangles works efficiently: the machine essentially \u201cslices\u201d the part into thin 2D layers as it processes instructions in order to interpret the 3D model.<\/p>\n
A Closer Look at Those Triangles<\/h3>\n
Each triangle is defined by three vertices within 3D space. Every vertex has X, Y, and Z coordinates specified in the STL file. These coordinates essentially create boundaries for the 3D printed material once the machine is running, and ultimately reproduce the shape of the final part.<\/p>\n
Each triangle in an STL file also has a specified normal vector perpendicular to the plane, which indicates its orientation in space. Normals are crucial for determining precise orientation of the front and back side of each triangles to ensure complete accuracy.<\/p>\n
The Importance of Your Mesh Resolution<\/h3>\n
The quality of each 3D printed part largely depends on the resolution of the triangular mesh described in the STL file. A higher resolution results in a more accurate representation of the original model. However, the downside is that higher resolution also leads to larger file sizes, slower printing speeds \/ less throughput, and the potential for more manufacturing errors.<\/p>\n
Solid and Shell Structure Parts<\/h3>\n
STL files can represent both solid and shell structures, basically for solid or hollow plastic parts. In a solid STL file, the triangles define the outer surface of the part as a closed 3D shape. In a shell STL file, the triangles represent a surface without defining the enclosed volume, which is ultimately hollow.<\/p>\n
Manifold or Solid Surface Geometry<\/h3>\n
A proper STL file should define the surface of the part as a manifold geometry \u2013 a solid, uninterrupted surface. Non-manifold models tend to cause issues during production because the holes or gaps cannot be sliced properly by the printer.<\/p>\n
Units, Scale, Color, and Texture<\/h3>\n
STL files do not inherently contain information about units or scale. It\u2019s therefore essential to export the 3D model with the correct scale. STL files also generally lack information about part color or texture, so these details must be otherwise specified.<\/p>\n<\/div>\n