Shelling Issue

[cherrud]

I have a shaped that I'm trying to shell, that will work when I use a shell thickness of 0.5mm, but not when I do 1mm. The error message I get says "The operation could not heal the edited region of the model."

I've tried looking through my model to see if there's any strange angles or anything, but it looks good to my novice eye. I've found other similar issues in the forums, but after looking through their fixes, I can't find the same issues with my own design. I've attached the file if anyone is willing to take a quick look. 

The design is for some plastic bins I have. I thought if I could model the shape of the interior of the bin, I could cut it up however I want afterwards, shell it out and 3D print various bins/dividers. I was actually pretty happy with out well it came out after some tests fits. But now that the shelling is giving me issues, and I'd really like to learn why. Any help is appreciated, thanks.

If anyone is curious, this is for the 18qt Sterilite Ultra bins. Feel free to use it. Might need a few tweaks (especially fixing this shelling issue) but it should be close.

[mango.freund]

hello @cherrud  take a look in the timeline.  greetings mango

[TrippyLighting · Accepted solution]

While @mango.freund's work around does the job, the culprit in this design is the loft command.

When lofting between profiles that use circular fillets, then use the "Keep" option for tangent edges.

Without that setting Fusion 360 tries to create that loft in a single continuous NURBS surface instead of separate tangent surface sections, and that create curvature problems, which the shell tool is very sensitive to. 

Once you do that the shelling operation completes at 1mm.

[TrippyLighting]

 the issues with surface curvature problems cannot really be observed in your design, because you used a straight loft.

However, in a design with a curved loft this can be observed. Although in this case the shell tool completes fine.

Curvature map analysis without keeping the tangency edges:

Curvature map analysis with the "Keep" option enabled:

[cherrud]

Wow, thank you @mango.freund and @TrippyLighting for your replies, both worked great! This was my first attempt at learning to use the loft tool, and I didn't know about that "keep" option. I was wondering why the curves didn't have the lines for the edges. I will definitely keep that in mind the next time I use it. It was a super quick fix, but I didn't realize I had caused shelling issues by not using it.

Mango.freund, I did like your work-around for if I didn't want to change anything about my model. It gave me some ideas for another project I've had issues with, so thanks!