You need to be looking at using The Dave Method when you are working on such small things.
I have used it here to make a copy component that is scaled by 100, this then allowed me to use a section plane through it to ‘Create Group from Slice’, which gave me a clean profile to use.
That slice can then be modified however you need to get the faces and thickness you want.
All edits you make to the large one will be reflected in the small one and when complete you can simply delete the large one and use the small one.
I have added the model, if it doesn’t make sense I can make a demo at another time.
Heart and WingsBox.skp (2.2 MB)
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