It took 450 hours to print a replica of the Anji Bridge in China. It took ten years to make the original
is a long-winded and tedious business, even when what is going down the slipway is a small craft made from modern materials such as fibreglass, rather than something nailed together out of planks of wood. Construct a mould. Build up layers of resin and glass fibre inside that mould. Extract the completed structure and finish it. All told, it can take months. That, though, may soon change.
And this can be done quickly. The Maine university printer is able to extrude material at a rate of 70kg an hour. At the moment it can make things up to 30 metres long, 7 metres wide and 3 metres high, but those dimensions could easily be increased by building a bigger gantry. The arm carrying the nozzle can also be fitted with processing equipment, such as an automated milling head to grind off any surface imperfections.
Oak Ridge is also working on ways to print concrete structures directly. The practicalities of erecting massive-printing gantries suggest printing skyscrapers and other large structures is probably best not done in one go, but in smaller sections. Printing precast concrete subunits in the controlled conditions of a factory and then assembling them on site can be better suited to making complex and artistic structures.
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