This semicircular surface wont draft with a parting line, but will draft the entire surface one direction. The end goal is to draft down the central line along the bottom round. Any Advice appreciated.
run the split line up the planar surface tangent to your circular surface and draft all the surfaces with a parting line draft.
i'm guessing the split draft is having a problem with the adjoining surface that you drafted differently and the two are fighting one another when they come together.
Only to know...
currentA.JPG and currentB.JPG is for a blow mold?
Forum.JPG is for a injection mold?
I think Michael is onto your problem, and I think you will also need to do something similar on the other side too. Without posting the model for people to look at (select "Use advanced editor") it's hard to guess.
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