Hi,
I am a new user in my trial period considering the purchase of Rhino. I am having a lot of trouble with naked edges. Seems that anything I model ends up with a lot of naked edges. I do not think I am modelling incorrectly. When I export stl for 3d printing it does not go well. For the life of me, I cannot find a method to fix them. joinedge does not work as it usually cannot find anything nearby enough to close the edge. zooming in finds nothing! I would appreciate any help or advice.
Thanks,
Alan
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Hi @alwi
if you can share a model we could have a look why that happens. Large and/or confidential files can be uploaded here
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Uploaded.
Naked Edges Issue.3dm (796.5 KB)
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The model is really a mess, contains a huge amount of duplicate curves, and has bad objects. You are trying to join edges that are too far apart to be joinable. (Did you use JoinEdge?)
I’m wondering how you managed to create this. Did you follow a certain tutorial for this?
It will be hard to fix it, much easier to remodel it properly. It’s basically a matter of making a couple of good base objects with fillets.
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attached is a quick remodel of the base object, simply build by a few filleted boxes and booleans:
Naked Edges Issue_base_SG.3dm (1.6 MB)
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Well I had tried a load of things to fix it… ‘rebuild’ seems to have created a large number of extraneous curves… My original had an edge roundover which was not enough, so I cut it out, recreated the bottom spliced it in. Obviously a mistake - how could I expect that to work! Anyway I am interested in the picture posted above - I cannot see that in any view, unless the gap has been exaggerated.
Countersink was using a cone to split flat surface.
Youtube tutorials mainly.
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You can create this by adding a closed cone at the hole location and then BooleanDifference:
Try with:
Naked Edges Issue_base_SG.3dm (1.1 MB)
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Top picture I moved the pink part up to highlight it.
Second picture is how your cad looks.
For most design work you should very rarely need to manually close gaps like this. Your design approach should be producing models without gaps.
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Thanks very much! I have erroneously been using ‘split’ to cut bits out of objects. I have a ‘Getting Started’ course booked for the 16th October which should set me on the right course.
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It’s not wrong, just a different method. Split for the corner chamfer means you would need to split both the cone and the base object, then Join
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I think everyone’s experience with Rhino in the beginner stages is similar, no matter how experienced they are in other CAD’s.
It’s like going from macro economics to micro economics, you realize the other CAD’s aren’t really CAD’s, cause Rhino shows you the truth.
Truth is there’s edges, and if you don’t model with the knowledge of those edges transforming over time and pulling away, then they will become naked.
The more difficult ones are vertices at star junctions, and ones where star junctions can be in the middle of adjacent edges and split them. Now, doing that without naked edge pinholes is a challenge.
Sometimes you literally have to zoom into the microscopic level and surgically stitch control points together to get it all to work perfectly. It all depends on how organic and compound the geometry is. 2.5D geometry is pretty straight forward.
nice! 
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The One video series I wish someone would have told me about when I first started using rhino it would be the free series on youtube by ThirtySixVerts. This is how you should approach modeling with Rhino IMO. It took me a bit to get my head around some of the ideas, like trimmed corner, but well worth it in the end. This guy is a master modeler.
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