Hi Art, can you please post the .3dm model file with the object you 're having problems with?

One thing that can make things difficult for chamfer or fillet is having surfaces that are not smooth to each other but are not too far off from being smooth.

The reason being that part of the fillet/chamfer process involves intersecting offset surfaces and 2 surfaces that meet at a shallow angle have more of a "zone of overlapping" rather than a crisply defined intersection.

So I'd probably try to make some of the pieces to be longer single smooth surfaces rather than fragmented into many faces with shallow angles to each other.

There is a kind of similar recent discussion thread here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10210.1

Anyway, if you can post your .3dm model file I can take a look and try to give some feedback. It is very helpful to post the .3dm model file along with your question instead of only screenshots.

- Michael

Hi Art,

re:
> but the fact I cannot even chamfer something so simple makes my confidence going
> forward shaky for the main design.

Well if it makes you feel any better, shapes that have surfaces meeting at shallow angles and containing vertices with 5 edges coming out from a single shared vertex are pretty difficult cases for fillet/chamfer, not really a simple case for them at all.

What would make it simpler would be to have lower number of surfaces - areas where you currently have blocky pieces meeting at a shallow angle should be larger smooth surfaces and that will help reduce higher vertex valence counts as well.

- Michael

Thanks for the help Michael. Here is the file.

Hi Art, I've attached a version that's been simplified, a couple of areas that had fragmented faces have been combined into a single larger face and I sliced off a sliver with an angled cutting plane to make just one single plane in place of 2 fragments that had a shallow meet-up angle.

This version should work better with Chamfer.

- Michael

Michael this is super helpful for understanding how this works. And now I'm trying to recreate how you got that cutting plane to line up the way you have it in the file in the first place. I tried three point plane on surface but it doesn't extend past the points I select. Was this a re-oriented plane or C-plane view method?

Hi Art, that was a 3 point plane that was then scaled, here's a demo:



- Michael

Ah, nice. Thankyou!

Hi Michael, after some practice, some test prints and your tips I went and remade the initial cutting solid over again in a few min with a simpler method of a few planes and blended edges. I am happy with the smooth interior result and this boolean cut is obviously the last step before exporting. fillets/chamfers done prior to cutting out the large cavity space.