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Exporting to stl

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Exporting to stl

  2. 2. STL FILES • Standard format for AM production • Triangular mesh representation of a 3D surface geometry • More triangles  higher definition • Find the compromise between the definition and the lowest possible file size  High sized files may not be processed by the Gcode generator software • Adding more triangles doesnt mean to obtain a more accurate built part, because the definition that can give the machine may be not as high“Standard Tessellation Language (STL) file is a triangular representation of a 3D surface geometry. The surface is tessellatedlogically into a set of oriented triangles (facets). Each facet is described by the unit outward normal and three points listed incounterclockwise order representing the vertices of the triangle. While the aspect ratio and orientation of individual facets is governedby the surface curvature, the size of the facets is driven by the tolerance controlling the quality of the surface representation in termsof the distance of the facets from the surface. The choice of the tolerance is strongly dependent on the target application of theproduced STL file. In industrial processing, where stereo lithography machines perform a computer controlled layer by layer lasercuring of a photo-sensitive resin, the tolerance may be in order of 0.1 mm to make the produced 3D part precise with highly workedout details. However much larger values are typically used in pre-production STL prototypes, for example for visualization purposes.”
  3. 3. EXPORTING STL FROM SOLIDWORKS The orientation of the building platform is the XY plane (FRONT PLANE in solidworks) Steps: • Click “Save as” • In “Save as type” list select: “STL (*.stl)” • Click “Options” • Output: Binary • Unit: Millimetres • Resolution: Custom • Deviation: 0,02 - 0,05 • Angle: 15º - 20º “Deviation and angle default values for “Coarse” and “Fine” depends on the surfaces and size of the model we want to export, the optimised values will always3 be between these two values.”
  4. 4. EXPORTING STL FROM SOLIDWORKS Steps for Solidworks Student Design Kit • File  Save As … • Set type to “eDrawings(*.eprt)” • Click “Options...” • Enable “Allow export to STL for Parts & Assemblies” • Click OK • Enter Filename  Save • Open part in Solidworks eDrawings • File  Save as…  select type STL Files (*.stl) • Save “With this way, you can’t choose the resolution of the output STL file, and it’s not the best. So avoid this system if your model has characteristic curved surfaces. Solidworks Edition on DTU Databar PC’s let you to export direcly to STL from4 solidworks. So only use that method if you have the Student design kit.”
  5. 5. EXPORTING STL FROM SOLIDWORKS“When exporting from an assembly, make sure you have ”Save all components of anassembly in a single file” is DISABLED, and all the components will be saved individually.”
  6. 6. SOLIDWORKS DESIGNING TIPS“Always check ”Merge result” is enabled when doing new features. IF this option isdisabled, the new features created will be new ”bodies” in our part, and we don’t wontthat.”
  7. 7. SOLIDWORKS DESIGNING TIPS“Before exporting to STL, you should have only one ”body” in your part. If, like is shownin the pic above, you have more than one, that may mean that you have been creatingnew features with the option ”merge result” disabled.”
  8. 8. EXPORTING STL FROM PTC CREO (PRO/E) Steps: • Click “Save a copy” • In “Type” list select: “Stereolithography (*.stl)” • Coordinate system: Default (TOP plane as XY) • Format: Binary • Deviation control • Chord height: 0,05 • Angle control: 0,5“You can see the output triangulated mesh when you click on “Apply”. Optimum valuesdepend on the size and surfaces of your part, so change the values in order to get amesh detailed enough to have smooth surfaces, but not more.”
  9. 9. PTC CREO DESIGNING TIPS “Enable ”Extrude as Solid” and ”Attached” when creating new features to our model.”9