Hi I try to cut hole as below [image] But they are closed non-manifold polysurface Need advice to fix it. Thank Travis

Posting the geometry would help people help you. Also please indicate which parts should be solid and which part(s) should be hole.

Hi I want to make 4 holes as below [image] Attached file box 100x100x100 rhino 6.3dm (343.5 KB) Travis

OK that’s straightforward! Make the outer box as a solid. [image] Make a smaller box and boolean difference it from the first box to get the outer walls. [image] Make a solid cylinder. [image] Select the outer walls and the cylinder and run _Nonmanifoldmerge. That gives you the sol…

Yes it’s non-manifold, Jeremy just showed you how to make it a polysurface anyway. To make this not non-manifold, you need to change the shape, the simplest thing is to make the cylinder or the wall thickness of the box bigger so that they don’t meet along a single edge at the quadrants. You techn…

[image] JimCarruthers: it’s impossible to machine, so it’s considered “bad” geometry Hi Jim, Do you know whether the non-manifold edge would be accepted by a 3D printer? I wonder whether the thickness of the extrusion would create a material overlap, but I’ve no experience of 3D printing. No…

[image] travis.designer.vn: Do you have any idea about it? I think Jim has answered this better than I did, but if you have any more questions then feel free to ask.

Hi @jeremy5 and @JimCarruthers I also thought about make one of them bigger then overlap each other. They will not be non-manifold. However It may not perfect accurate. I learn a course 3d print with Rhino in Linkedin.com She also said that should make one of them bigger then can boolean. Devel…

This might print fine. Of course you could also try printing them without merging them together, the result may be very much the same. I don’t really know what you expect to happen here, you’re asking to make an object that’s mathematically not a solid, it’s connected at those points by an infinit…

[image] JimCarruthers: add a fillet between the inner and outer shapes A nice way to do this is to go back to your original corner curve: [image] and fillet it where marked, make the other curves the same, then use _WireCut to cut through the original box: [image] I’ve used quite large f…

How to fix non-manifold polysurface?

Rhino Rhino for Windows

travis.designer.vn (Travis Nguyen) July 21, 2021, 3:30am 5

Hi @jeremy5
I follow your instruction.
It still non-manifold.
Detail in screencast below:

Do you have any idea about it?
try fix non-manifold v1.3dm (255.0 KB)

Thank
Travis

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How to fix non-manifold polysurface?

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