Hello,
There is no change when a value smaller than the existing fillet radius is entered. It gives results only for larger values.
Rhino
Autocad
In the example above the straight lines with the R60 fillet need to be extended for an R10 fillet. Fillet command needs the two lines/curves to be filleted to be selected by the user. Fillet will automatically extend lines and curves to enable fillets, if the lines/curves are separate and not part of a polycurve. Fillet | Rhino 3-D modeling If the polycurve is exploded, or if the existing fillet is extracted (ExtractSubCrv with Copy=No) then Fillet can be used to create fillet with a smaller radius.
FilletCrv uses a polycurve as input, and only creates fillets at kinks and corners. It does not recognize existing fillets.
Hello David,
You can watch the video below to better understand my request. I think the Fillet command should be enhanced in this direction.
@hesro it makes sense, currently Rhino doesn’t do that. You could however Ctrl+Shift select the arc, delete it, then make your new (smaller) arc.
Hi @Gijs ,
I have to do this process on too many curves, so I transfer it to Autocad and do this work there. I raised this issue because I wanted to remove Autocad from my workflow.
I have created a workaround with the help of the following post. Thanks @HS_Kim
I wanted to share it for those who may come across this post in the future.
This is the process:
Thanks,
A solution where I don’t need grasshopper player would be nice 
I will follow this issue but the link is broken or not visible to us.
fixed