Unable to create fillet due to non-manifold body

[andrew.Ye122]

I'm trying to create a fillet on the inside of my mouse shell but was unable to select the edge I wanted. Turns out the "true" edge is sitting inside the extrusion. So I tried to fillet that to see what would happen and it gave this error:

Hovering over the loft feature in the model browser shows three edges where there should only be two:

How can I resolve this issue? I've linked the part below

[kacper.suchomski]

Hi

1. It is better to make this type of segments in several steps - create the external and internal surfaces separately (or external + Offset/Thicken).
2. In the case of Loft, it is worth setting the condition of contact with the selected cross-section.

[johnsonshiue · Accepted solution]

Hi! I would not use Loft for this particular case. But it is indeed fast. The Loft in this case leads to sliver faces, making the body non-manifold (an edge shared by more than two faces). You will need to delete some faces to see those interior sliver faces and then delete them. Please see attached part. It should work now.

Many thanks!

[andrew.Ye122]

Thank you so much for the help! You mentioned using loft is not recommended for this, what would you have done instead?

[johnsonshiue]

Hi Andrew,

For this case, I would use Surface Loft instead of Solid Loft. Surface Loft helps define the boundary. You can use Sculpt or Stitch to bind the surface to the solid body. Solid Loft can create near tangent side faces which may not fully intersect with the solid body.

Many thanks!