Fillet edge nightmares

Hi everyone,

I’ve been having some issues with filler edge command, like many of you, but this one is fairly special.
I’ve been running filletedge all day fine but suddenly i started getting an “Failure in trimming input.” and a surface will delete. I thought this was just the shape but when drew up a rectangular prism (from the basic command), I’m still getting an error. Any thoughts on a remedy? Its super frustrating because it tackled several complex fillets earlier and this is literally a box… Thanks in advance

Step 1: units and tolerances? Anything out of whack?

Nope. The tolerances are fine, and the units are as well, the fillet is within size to fit.

Please post a 3dm file with an example of this, indicating which edges you want filleted, the radius, and the RailType option. It may be that you are overlooking something, and I want to rule that out before digging further.


If I’ve interpreted right, you were “banging” on it all day, then it “broke” and you tried something really simple you think should be a snap, and that did not work either, correct?

Did you try restarting? Sometimes a simple restart will fix wonky stuff…sometimes…

Well it seems to have sorted itself out. I rebooted and rebuild one edge and got a failure to form corners error, exploded then rejoined and it all went smoothly. Must have been a freak thing, maybe from running all day or something.

I’m glad it works for you now, but something still sounds wrong. You probably shouldn’t have had to rebuild the edge, explode and rejoin to get the fillet to work. If you can, please post, or send directly to, the model in the state where the fillet fails. I’d like to see if I can fix it.

Chuck Welsh
Robert McNeel and Associates