Fusion
The Shell command picks up the external features as it develops the inside wall thickness. I believe your complex and sharp edges on the outside are preventing the Shell command from working. I used a different method which does not guarantee the 3 mm wall thickness but it is the only way I could see to do it. Model is attached.
John Hackney, Retired
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No, actually this is following a YouTube tutorial created by one of the earlier Fusion 360 evangelists.
I've seen this object many times with the same problems.
It starts with a T-Spline, which is completely unnecessary fo this geometry. If you create the very 1st object using a loft and profiles the rest is going to be fine.
And, of course when you export this object as is into STEP format and re-import it, it shells perfectly fine.
I have an arsenal of these files now, some more complex and some simple such as this. The curvature map does not indicate much of a problem, still Fusion 360 refuses to shell the object. Fusion 360's procedural surfaces have a problem with themselves.
It really gets in the way of getting work done.!
@sts0 If his objec this created using proper techniques it'll shell like a charm. Unfortunately too many poeple make tutorials showing bad techniques.
You need to look at this design from a 30,000 foot level and try to get the overall approach.
You could also try replicate this step by step and create you own first sketch. You'll notice (hopefully) that the purple dot appears as soon as you are creating a horizontal constraint between the spline end point and the sketch origin. Then it becomes clear where that purple dot originates from.
