I have a problem whit the extrude feature
Here is how you do it.
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Step 1:
1. Use sketch 5 to create a split line instead of the curve you created
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Step 2:
2. Use surface offset and select the new formed surfaces and the direction
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Step 3:
3. Delete the original surfaces.
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Step 4:
4. create a 3d sketch and use the edges around the gap
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Step 5:
5. Use the 3d sketch to make a boundary surface.
Good luck.