Guys, I cannot seem to get the yellow surface to surface fillet here. It doesn’t matter if I change the size of the fillet, still no fillet. I have tried this in Rhino 8 and V9 WIP, it fails in both. I run into this condition repeatedly and an wondering if I’m doing something stupid? Any help w…

This is what I would do for car body panels. However, for tiny areas where the goal is to create true radius fillets that will be CNC-milled with the same radius round milling tool, the fillet is the preferred way to make it. The main reason is that the better CAM programs automatically recognize f…

It’s time for the Rhino developers responsible for the fillets to work harder, because Rhino 9 is around the corner and we want to buy a better program than what the current Rhino 7 and Rhino 8 could achieve. :smiley:

It’s interesting to see your comment on the CNC optimized strategy. This is something I have never taken into real consideration. If this spesific tooling focus is important for a major user base and thus worth focusing on is something for McNeel to consider though.

It’s often very important for any product going into production, products that require cost-effective tooling. A concave radius fillet can be milled by a ball-nose end-mill, a wonky “radius” takes much more time, and time is money. It’s not so much a software thing, but designing according to forma…

Using true radius fillets allows the CAM programs to quickly set a curve path for the CNC-milling. This is automated in all professional CAM software plus some CAD programs, such like Solidworks. I have been working on many projects where the goal is to carve small radius fillets with 2-3 mm ball t…

On the left, you see a single-pass milling strategy that requires less machine time and ability to carve the whole area at once. Not to mention that the CNC-machinist is able to generate the g-code automatically for all radius fillet areas, whereat the example on the right side will require multiple…

[image] Rhino_Bulgaria: It’s time for the Rhino developers responsible for the fillets to work harder, because Rhino 9 is around the corner and we want to buy a better program than what the current Rhino 7 and Rhino 8 could achieve. :smiley: I can guarantee you that @menno is working hard on …

Lets hope that the end result will be clearly seen in Rhino 9! These bug reports are super useful way to test the improvements of the “Fillet” tool. :smiley:

[image] Lagom: Normally, singularities should be avoided in surface modelling. A constant radius fillet without a singularity can be made as a 4 sided trimmed patch. pointy_fillet_No_Singularity.3dm (2.5 MB) The constant curvature of .197 can be confirmed visually with Rhino’s surface curva…

More Fillet Issues V8 & V9 WIP

Rhino Rhino for Windows

brian (Brian Gillespie) August 26, 2026, 1:59am 26

RH-89085 is fixed in Rhino BETA

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More Fillet Issues V8 & V9 WIP

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