Hello. Following up on my question from yesterday (which I marked "correct answer" since my original question was answered), I'm now trying the revolved cut on my railing spindle drawing as suggested instead of doing in 3 parts. I'm getting the "zero thickness geometry" error even though I thought I was going about the steps the right way. Suggestions on what I'm doing wrong? I'm posting the .sldprt as well as a screenshot. Thanks again.
You don't have any material to cut in the area near to center of profile. So you need to do that cut revolve in two features and have some area to cut in revolve cut.