39-245
Rapid Design through Virtual and Physical Prototyping

Carnegie Mellon University
Spring 1997



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Limitations of JP System 5: stl File Creation

Creating inner rounded edges causes problems with the STL file and hence causes problems with the slice file used to produce the prototype. An example of an inner rounded edge is inner portion of the torus. If you would like to see specifically the problem that it creates, open the slice file called TORUS and view sheets 8 and 13. It is unknown why problems occur because technically they shouldn't. However, until the problem has been rectified, save yourself some hassle and work around this problem by creating parts that do not have inner rounded edges.

If you feel that it is absolutely necessary that some portion of your part need to have rounded edges, here are a few suggestion to try to work around the problem.

Change the FACETRES variable when creating the stl file in AutoCAD 13. This gives more detail for the model and might work in creating an accurate stl file. Look up FACETRES in the AutoCAD help for more detail explanation.

Created rounded edges using the REVOLVE command in r13. This creates more accurate stl files than using TORUS, SPHERE, or any other primitive solid.

Try to minimize the use of the FILLET command on your model. This also creates problems with stl creation.

Even after using these suggested techniques, you may still need to look at each of the sheets after slicing. You may have to manually remove slices that have obvious errors and then proceed with building the prototype. This may be tedious, but the creators of JP Systems 5 have suggested no way of remedying this problem.

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