Denture STL appears hollow on outside in Exocad (milling feature issue)

[Andrew Wood8]

I am working on creating a library in Exocad with three different mill files for items we have designed. I have the full designs in solidworks and have exported them as an stl and verified the proper outside to the STL. These are being used for full arch fixed case design. I created a scan with 6 abutments and then put 2 each of the 3 features in it to see how it works. For the cementable TiBase, the file looks fine, but for the prosthetic screws, I am getting one that fills in the hole and both give a hollow geometry on the outside on the top side. Does anyone have any suggestions on how to correct this?

Model Picture - First two are Cementable TiBase, Middle two are Long Prosthetic Screw and last two are standard Prosthetic Screw
Test Model - This was created in Exocad using these files in a library
Cementable TiBase - This file appears to work fine
Long Prosthetic Screw Channel - One fills itself in, both files are hollow on the outside
Short Prosthetic Screw - One fills itself in, both files are hollow on the outside

 

[William Wood]

Hey Andrew, what systems are you currently using? I know that some techs here are using a combination of programs to make these files work. I'm not sure if @zero_zero is still active, but he might be able to help you.

 

[Andrew Wood8]

I am using SolidWorks to Created soldi models, then deleting the some of the faces to make an STL. I am opening it in MeshLab to verify that the normal are facing the correct way and that all appears correctly. I have run the STL through ChatGPT and it is saying that I have created a non-watertight STL, which could be causing the issues. I then had ChatGPT correct it, but the new model is now crashing ExoCad. I am now wondering if I need to import the model into another software to get the proper STL created. Any help is much appreciated. Thanks

 

[zero_zero]

Ouch... This is how your stl shows up after the analysis

Way too many issues for a quick fix.
First of all go though the exo documentation about how to setup the geometries, paying attention where to flip the normals so you don't end up with non-manifold files like this. You can do it in meshmixer if you have to.

 

[KKnapp]

I am working on creating a library in Exocad with three different mill files for items we have designed. I have the full designs in solidworks and have exported them as an stl and verified the proper outside to the STL. These are being used for full arch fixed case design. I created a scan with 6 abutments and then put 2 each of the 3 features in it to see how it works. For the cementable TiBase, the file looks fine, but for the prosthetic screws, I am getting one that fills in the hole and both give a hollow geometry on the outside on the top side. Does anyone have any suggestions on how to correct this?

Model Picture - First two are Cementable TiBase, Middle two are Long Prosthetic Screw and last two are standard Prosthetic Screw
Test Model - This was created in Exocad using these files in a library
Cementable TiBase - This file appears to work fine
Long Prosthetic Screw Channel - One fills itself in, both files are hollow on the outside
Short Prosthetic Screw - One fills itself in, both files are hollow on the outside

Check CAM software tool path and check for internal cavities that might cause an error.