FilletSrf fails to produce 12 mm radius

[Rhino_Bulgaria (Bobi)]

Thank you for the insight and time to comment on the matter! I have the same observations and honestly I mostly use the great script by @jim posted here:

Filleting Tangent Surfaces

For those Rhino users who use the FilletSrf command and would like the process to be a little less tedious here is a Python script that will make strings of fillets that expands FilletSrf capability when filleting tangent surfaces: FilsrfEX.py (40.1 KB) This script works the same as the filletsrf command - just pick 2 surfaces that you want to connect by a fillet. The difference is the script will continue to make all the tangent fillets connected to the first fillet until it runs out of tangen…

Sadly, since it relies on the FilletSrf tool, it also fails to produce fillets in certain situations where the operation requires an extended fillet surface to meet the criteria for building it.