Liquid recovery is achieved through an external ventilation mechanism designed at the nozzle outlet, ensuring smooth flow of the recovered liquid and preventing vapor generation that could cause backflow, overflow, and splashing. The angle of the collection tray is set slightly larger to suit viscous liquids such as engine oil. For less viscous liquids like gasoline, the collection tray angle can be reduced during modeling—around 90 degrees, for example—or the upper cylindrical section of the tray can be made taller for better results. During slicing, since there is minimal contact with the print bed, it is advisable to add a skirt feature, with a support threshold of 30 degrees to improve success rates.