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@Jonny69
CF would have to be reamed and faced after de-moulding. You could probably co-mould ally or Ti inserts and have them accurate enough to be concentric, but they’d still be covered in resin after curing.
It’s a mould split line thing. The resin gets sucked/squeezed into the gaps between the mould parts, so it generally needs cleaning off after it’s de-moulded.