Design for moulding / Surface modelling practise

Nowadays, bike frames are made of all kinds of materials. Aluminium and carbon fibre are commonly used in race bikes, both are highly malleable materials suitable for different kinds of moulding processes. In order to strengthen to the bike frame, manufactures would invest cast or mould some of the parts prior to assembly, process as such changes how the particles interlink with each other.

The more complicate the mould, the more it will cost and more likely for it to fail to produce a quality product. Taking this idea to practise, I have put myself in the shoe as if I am designing the seat stay of a road bike frame with surface modelling techniques on CAD program. I have considered elements of applying fillets and draft angles to avoid possible damage when end product is being withdrawn from the mould.