According to data provided by Optician partners in the Consortium, ~20%-40% of spectacles are stocked up with conventional production systems that most of the times are never selled and can be considered waste. Based on that figure, 1.3 spectacles (30% of stock) should be produced in standard manufacturing process in comparison with the Optician 2020 production system. Besides, additive manufacturing technologies improve the energy consumption and raw material
output/input ratio of traditional processes
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