Architecture, Building and Structure Design Arachne- A 3D Printed Building Facade Building Facade by Lei Yu The mass gift-wrapped by Arachne is a three-floor building of 10 meters in height and 12 meters in width. This assignment was contracted to cover the main facades, which face an important public square, with a strong iconic articulation to collect attention. 3D printing technology was selected to meet this requirement owning to its fabulous capacity of adopting the design concept.