Did You Know?
We offer a wide range of UL-Approved flame retardant urethane materials with VO ratings and corresponding yellow cards.

Prototypes made with UL rated materials are widely used for obtaining quick product approval from government agencies such as the FAA, FCC or The Food and Drug Administration. 

How do I translate my 3D Solid CAD model to STL format?
The information was taken from the Internet. Some of the information could be outdated so please see your CAD manual for instructions.

These are only general guidelines and may not work or produce the best possible STL files in some cases. Please consult your user's guide or the software developers for more information or technical support.

What is an STL?
STL (Stereolithography) is the de-facto standard file type used by most or all Rapid Prototyping systems. A STL is a triangulated representation (tessellation) of a 3D CAD model.

The triangulation of a surface will cause faceting of the 3D solid model. The parameters used for outputting a STL will affect how much faceting occurs.

The rp model or prototype built, is a smooth or as faceted as the STL. Think of the rp systems as a replicator of the STL file. If the STL is coarse and faceted, so will be the prototyping model.  This applies to any rp technologies such SLA, SLS etc.

In the 3D solid CAD program, when exporting to STL, the parameters that affect the faceting include the following, chord height, deviation, angle tolerance, or something similar.

The finer the STL the larger the file is in size, which will affect processing time as well as build time. Below is information found on the Internet regarding exporting to STL from various CAD programs.

STL Creation
The following are general guidelines and may not work or produce the best possible STL files.   We highly recommend that you consult your user's guide for more information.

AutoCAD (Versions: R14-2000i)
Your design must be a three-dimensional solid object to output an STL file.

  1. Be sure the model is in positive space
  2. At the command prompt type “FACETRES”
  3. Set FACETRES BETWEEN 1 &10. (1 Being low resolution and 10 high resolution for STL Triangles)
  4. Next, at the command prompt type “STLOUT”
  5. Select Objects
  6. Choose “Y” for Binary
  7. Choose Filename


  1. File > Export > Rapid Prototype File > OK
  2. Select the Part to be Prototyped
  3. Select Prototype Device > SLA500.dat > OK
  4. Set absolute facet deviation to 0.000395
  5. Select Binary > OK


  1. Right Click on the part
  2. Part Properties > Rendering
  3. Set Facet Surface Smoothing to 150
  4. File > Export
  5. Choose .STL

Mechanical Desktop

  1. Use the AMSTLOUT command to export your STL file.
  2. The following command line options affect the quality of the STL and should be adjusted to produce an acceptable file.
    1. Angular Tolerance - This command limits the angle between the normals of adjacent triangles. The default setting is 15 degrees. Reducing the angle will increase the resolution of the STL file.
    2. Aspect Ratio - This setting controls the Height/Width ratio of the facets. A setting of 1 would mean the height of a facet is no greater than its width. The default setting is 0, ignored
    1. Surface Tolerance - This setting controls the greatest distance between the edge of a facet and the actual geometry. A setting of 0.0000 causes this option to be ignored.
    2. Vertex Spacing - This option controls the length of the edge of a facet. The default setting is 0.0000, ignored.


  1. File > Export > Model (or File > Save a Copy)
  2. Set type to STL
  3. Set chord height to 0. The field will be replaced by minimum acceptable value.
  4. Set Angle Control to 1
  5. Choose File Name
  6. OK

ProE Wildfire

  1. File > Save a Copy > Model
  2. Change type to STL (*.stl)
  3. Set Chord Height to 0. The field will be replaced by minimum acceptable value.
  4. Set Angle Control to 1
  5. OK


  1. File > Save As
  2. Select File Type > STL
  3. Enter a name for the STL file.
  4. Save
  5. Select Binary STL Files

SolidDesigner (Version 8.x)

  1. File > Save
  2. Select File Type > STL
  3. Select Data
  4. Click OK

SolidDesigner (Version- Unceratin)

  1. File > External > Save STL
  2. Select Binary mode
  3. Select Part
  4. Enter 0.001mm for Max Deviation Distance
  5. Click OK


  1. File > Save As
  2. Set Save As Type to STL
  3. Options
  4. Set Conversion Tolerance to 0.001in or 0.0254mm
  5. Set Surface Plane Angle to 45.00
  6. Save


  1. File > Save As
  2. Set Save As Type to STL
  3. Options > Resolution > Fine > OK
  4. Save


  1. File > Save As
  2. Set Save As Type to STL
  3. Save


  1. File > Export > Rapid Prototyping
  2. Set Output type to Binary
  3. Set Triangle Tolerance to 0.0025
  4. Set Adjacency Tolerance to 0.12
  5. Set Auto Normal Gen to On
  6. Set Normal Display to Off
  7. Set Triangle Display to On


  1. Choose Stereolithography from Export options
  2. Enter the Filename
  3. Click OK


  1. Save Copy As
  2. Select STL
  3. Choose Options > Set to High
  4. Enter Filename
  5. Save
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