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need help with the union option

I am stuck in the Learning Path - Introduction to Part Studios - Advanced Features/Exercise: Funnel
I am stuck on step 12 of 18. When I try to create a union between part 2 and part 1, I receive a response of (Boolean resulted in no geometry change. The parts either do not intersect or are totally contained). I am unable to create the desired one uniform color of grey for both parts.
my document link is in the Tags box.
any help would be greatly appreciated.
Answers
Hey @james_anderson507,
Make sure that you select the entire sketch 2 for the loft selection, this will result in two bodies that overlap. Also, you need to shell first (select two faces to remove) and then boolean: https://cad.onshape.com/documents/348498487d9b6a519ae20a50/w/ab5c11aa59993e768192371d/e/3dc2d26455f1124a3cc752a0
Hope this helps.
Cheers,
David