Informing additive manufacturing technology adoption: total cost and the impact of capacity utilisation

Abstract

Informing Additive Manufacturing (AM) technology adoption decisions, this paper investigates the relationship between build volume capacity utilisation and efficient technology operation in an inter-process comparison of the costs of manufacturing a complex component used in the packaging industry. Confronting the reported costs of a conventional machining and welding pathway with an estimator of the costs incurred through an AM route utilising Direct Metal Laser Sintering (DMLS), we weave together four aspects: optimised capacity utilisation, ancillary process steps, the effect of build failure and design adaptation. Recognising that AM users can fill unused machine capacity with other, potentially unrelated, geometries, we posit a characteristic of ‘fungible’ build capacity. This aspect is integrated in the cost estimation framework through computational build volume packing, drawing on a basket of sample geometries. We show that the unit cost in mixed builds at full capacity is lower than in builds limited to a single type of geometry; in our study, this results in a mean unit cost overstatement of 157%. The estimated manufacturing cost savings from AM adoption range from 36 to 46%. Additionally, we indicate that operating cost savings resulting from design adaptation are likely to far outweigh the manufacturing cost advantage.

Keywords:

• rapid manufacturing
• cost estimating
• operational research
• additive manufacturing
• build volume packing
• technology selection

Acknowledgements

The authors wish to express their gratitude to Stefano Boccolari and Claudio Ferrari, Manufacturing Technology Manager and Manufacturing Technology Specialist at Tetra Pak for their support in providing the data flowing into this model. Additionally, the authors wish to thank Simone Casella, General Manager at Beam-IT and Alessandro Vecchini, Technical Manager at CALF.