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knowledge base
making models: STL - stereo lithography format
For mono prints, the design file is converted to
a mesh of triangles defining the form of the object.
STL is a standard output format from most CAD software,
and the number of triangles used can be user-defined.
There is a trade-off for most models between detail
and file size. Mapping any curved surface with flat
triangles (facets) means that a lot of small facets
are needed for a smooth curve, but this generates
a very large file, which can be difficult to handle.
The three points that make up the 3D facet along
with a unit vector describing its normal direction
define every facet in an STL file.
STL Problems and Solutions
Gaps between facets, inverted normals and duplicate
faces & edges can all cause non printable STL
files. Software like Magics RP can fix some of these
problems in the STL format but often problems need
to amended in the CAD program before exporting. ZEdit
can sometimes fix files that the ZPrint software cannot
even open.
For MicroStation users also see Creating STL files
from MicroStation.
Rhino v3 Users 3D Printing from Rhino Version 3.0
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