Time to make a new mould.
I managed to get a decent wax cast from the first mould which I dressed to make into a pattern for the second:
I decided to include a pouring hole in the design for this mould – more to assist with cooling and extraction than for the pouring process itself. Also a few extra details like handles, because I’d been struggling to part the two halves of the last mould.
Wow! This mould works a lot better! The first three casts have all come out successfully, so I now have enough to experiment with to try and get a solution for inserting and fixing the electronics…