Hi Michael,

After having a bit of time doing this it seems NX struggles a bit also, it does manage R=3 with Edge blend and Face Blend before the surface gets funky when you go over R=3, the Soft Blend option is at R=4, had no time to analyse the results, so I've attached a .3dm with all three, they are all named according to what method was used to fillet.

Cheers

Hi Danny, the edge blend and face blend ones (the 2 on the left) are interesting - it kind of looks like it switched to a sort of rail-revolve type generation in that area. Those are nice on the interior portion of the revolve but has a kind of bump or lack of continuity where the corner patch touches the fillet. You can see it clearly if you turn on metallic lighting in MoI and hide the edges:






The soft blend one seems pretty good though, maybe just tiny subtle hint of a lump in one spot. The control points on it are clustered in some areas but it doesn't seem to suffered much for it at least in this particular case:



- Michael

Here`s IronCad 1,7 mm round. R1,75mm didn`t work for basic round.


Thanks,

d3