What would be the best way to fillet the edges on this polysurface?

Rhino Rhino for Windows
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1

Hi there. With every project I have done filleting always causes the most issues for me. The current project I’m working on is no exception.

Fillet edges
Fillet edges1052×741 206 KB

In the above image I am trying to fillet the highlighted edges with a radius of 1mm. Works perfectly for everything except the 2 edges that form a point at the bottom of the inside circle.

Fillet points
Fillet points585×520 35.6 KB

This is what happens at those 2 edges. Normally my go to fix for this is to trim the fillet surfaces back and then NetworkSrf the edges. However the fillet makes such a mess of the points that I’m not able to use my go to fix.

Let me know what methods I could use to achieve this result. Filleting in Rhino I have noticed isn’t great in general but this seems like such a simple task that there must be a way to get it to work.

Here is the Rhino file:

Fillet help.3dm (1.3 MB)

Thanks in advance!

2

Fillets that come to a point are the biggest filleting weakness in Rhino.
It is essentially the very same bug that you ran into when trying to trim these same surfaces.

The problem is that in that area where the fillets and intersections go all wonky everything is flat (i.e. planar). One way to deal with this is to just make that area a planar surface and eliminate the pointy ends of the fillets.
Just cut that part off and make it as a planar surface and the result is edges well within tolerance
Filletx.3dm (414.7 KB)

3

Ahh alright I understand now why I’ve had issues with fillets that come to a point before.
Thanks so much, will use this anytime I have this issue now.