Novel additive manufacturing and 3D printing technologies are paving the way for improved development and construction of parts in many sectors. As a result, there is increased demand for methodologies, parts or technologies utilising these breakthroughs. In this context, the EU-funded OPTIMA project will develop novel 3D reactor technology for chemical reactors that employ additive manufacturing. This technology promises to improve selectivity and heat transfer from its rivals and expand our knowledge of mass transfer, kinetics and heat transfer. The project will show the advantages of incorporating a large eddy simulation platform with finite rate chemistry for turbulent reacting flows. It will reshape the chemical industry through a novel methane conversion into a platform molecule process.