I would like to but how...? Then we could CAM a new mould from aluminium/steel.
The inside part of the mould I made with a steel tube and fibre reinforced epoxy resin (chemfix). Very smooth surface.
The two outside halves are made using sand and cement. Very strong but a few tiny air bubbles. I tapped the soft cement a lot to get most of the air out, but there are still some tiny holes. Maybe the beeswax will fill them. You can still see the part number in the cement! 👍🏻