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DThere are many reasons to skip deep-fried fast food,one ofwhich is the challenge of dealing with used cooking oil.But re-searchers at the University of Toronto have discovered amusingmethod of transforming this useless waste product into an afford-able plastic ink for 3D printers.And there's more good news!The ink can break down naturally,unlike conventional 3D print-ing resins(树脂).Professor Andre Simpson,director of the Department ofChemistry at the University of Toronto,first became interestedin the idea when he got a 3D printer around three years ago.Af-ter noticing the molecules (used in commercial resins simi-lar to fats found in cooking oil,he wondered whether such a mol-