Creating Solid body from .obj

[Anonymous]

Good Afternoon,

I have searched the foruns, youtube, all sorts of tutorials, for the life of me I can't create a solid body for cnc milling from an .obj file. Help would be much appreciated. My plan is to create a solid body from that file and than modify it.

The file in question is this one (Thank you for this model danteklausoon)

https://www.thingiverse.com/thing:4199615

Best Regards,

[TheCADWhisperer]

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@Anonymous wrote:

Good Afternoon,

I have searched the foruns, youtube,....

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You have an issue somewhere in your geometry - you will want to display in Box Mode and track it down.

I think rather than use someone else's flawed geometry - I would model it myself as native geometry in Fusion.

[Anonymous]

Followed that exact tutorial multiple times to no avail. When I try to convert to BRep it always gives me an error, "T-Spline surface self-intersects", then I looked how to sort out that problem but people seem to have that problem when they have "red stars" on the model and I don't have any. *Red stars when they do the utilities -> Repair body.

Any ideas?

Thanks for your reply,

Best Regards,

[TheCADWhisperer]

I would start over and model from scratch.

[Anonymous]

Unfortunately it is a complex shape for me to model from scratch. Might have to abandon the idea.

[TrippyLighting · Accepted solution]

The first thing to do when working with meshes is to actually inspect them.

Obviously, this is a quad mesh. Usually, that lends itself well to conversion into a T-Spline. However, when trying that Fusion 360 will complain about self-intersections.

Looking at this mesh a little closer reveals that the original model already had a few problems and also has been subdivided to work for download only and not modification. This mesh has over 40000 faces, which is completely unnecessary for the level of detail captured in the model.

So I. went ahead in Blender, my mesh molding tool of choice, and applied a Decimate modifier with the "un-subdivide" option enabled and a level of 6. This is the result:

However, it leaves a few areas with triangles.

 

In a Sub-D model you can get away with that, but for a T-spline model I'd cleaned that up:

 

 

 

The result is then exported from Blender as a much smaller .obj file and the mesh is inserted into the fusion 360 design.

Then a new form is started and the mesh converted into a T-Spline and then  solid body:

Model is attached

 

[Anonymous]

LEGEND! 😍 Thank you so much for your time and knowledge. Next time I know that I need to start with the original mesh. Quick question, you used blender, would you be able to do the same thing on mesh mixer?

Best Regards,