Are we sure we are talking about the same thing?
I am not talking about a (e.g. 0.15 mm) 'gap' between the raft and the model which is supposed to stop the model sticking to the raft like a limpet on a rock. I am talking about elevating the model 1.5 mm above the raft and filling that space with support material. Is that what they call 'Raft Air Gap' ?
Try taking a look at Raft settings:
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