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...technique where a print head is used to control the deposition of polymer on a substrate drop by drop...As the name suggests, the process works similarly to traditional 2D printing. Material is added drop by drop rather than layer by layer, by controlling the flow of material using piezoelectric flow restrictors similar to those used in standard desktop inkjet printers....

...techniques which took into account the lines of thrust within an arch. The Pinnacles Professor Francis Evans shows why the pinnacles at Ely Cathedral are not just aesthetical, but how they balance out the forces within the structure. 16th Century Extensions John Trapp and Professor Jacques Heyman look at how medieval engineers managed forces within the stonework at Ely...