Converting mesh from an STL is creating holes and missing faces in the model

[SlowEvo]

Most of the time it works and I do it as follows: Insert mesh -> Generate Face Groups(Type: Accurate) -> Convert Mesh(Operation: parametric. Method: Prismatic) . After converting mesh it has holes and completely missing faces. I also get an error - "Compute failed. Not all facegroups of the mesh body could be converted. The generated solid or surface body is not complete."

The mesh doesn't have too many faces or triangles. I'm pretty new to this and this is the only way I know how to convert meshes into solids. All other times it has worked.

In the warning message it also states "Try a different method for conversion or adjust the face groups to correspond better to geometric features of the mesh."

Are there any mistakes I'm making during this process or another step I should be doing? What other methods can I use and/or how do I adjust the face groups like the warning suggests?

Screenshots are 1. After inserting mesh with properties shown, 2. The mesh after being converted.

The .f3d is also attached.

[TheCADWhisperer]

This stl is very poor quality.  Can you obtain a higher quality mesh with more triangles?

I would use only as reference in creating proper native geometry.

[SlowEvo]

@TheCADWhisperer 

There isnt another version available to download unfortunately.

Theres another model Im having the same issue with, it does have a lot of faces and triangles(Screenshot attached with properties). Not sure if thatd be the reason. I also don't know how to modify it to have less triangles, or of any way to make it easier to work with.

Files attached if you don't mind looking.

Thank you

[jhackney1972 · Accepted solution]

You can use the methods outlined in this Blog Article and Video to help you create a solid model using your Mesh body.  The method outlined will allow you to create sketches from the mesh body so you can use standard modeling features to get a more robust outcome.   One hint: If you decide to try it on this model, you first need to Repair- Rebuild it as it has some issues. Open your mesh and start with the Repair.

[SlowEvo]

@jhackney1972 Fantastic info! Thank you!

[TheCADWhisperer]

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@SlowEvo wrote:

There's another model I'm having the same issue with...

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This perplexes me that it isn't obvious?

Don't you see that the geometry is rubbish?

It is obvious that the Design Intent is for there to be curves in the geometry - but there is not a single curve. Not one?

All straight lines and faceted planar triangles.

Fortunately the geometry is relatively simple to model as high-quality native geometry with beautiful cylindrical and helical features.  Easy to edit too!

Zoom way in on the "curves".  What do you observe?