Additive Manufacture in essence means a production process based on additive principles rather than subtractive processes. Brick masonry is in this sense an additive process, where material loss is minimal, while timber construction is essence is a subtractive process, with a loss of material from the original tree to the final timber beam. The current meaning of the term additive manufacturing – or AM – indicates an automated procedure of depositing material in a controlled way in order to produce an object, an architectural building element, or a complete architectural structure. This process is analogue to the principles used for 3d-printing, a technology originally developed to automatically produce models and prototypes – often referred to as rapid prototyping. AM brings this up in scale and scope, addressing instead the final production aspects. Within product design, AM can use very similar technologies as 3d-printing, with a wide range of materials. The AM process here typically cannot compete with other automated production methods that depends on repetition, it is instead often directed towards bespoke elements of complex form, often referred to as mass customisation. Within architecture and construction, AM requires a different scale and economy in production. While construction often combines repetition and bespoke elements, it does not entail the extreme mass production of other industries. It may however minimise the material loss of subtractive processes or the casting of concrete, it can provide opportunities to allow a more articulated design that was previously depending on very skilled labour and could potentially automate many procedures of the construction process.This provides a promise of efficiency in terms of sustainability and economy to AM applied in construction. It also suggests that the potential architectural performance of AM is of relevance. While this ARQ project considers efficiency of construction processes to certain extents, the primary concern has been the performative architectural aspects of the produced material outcome – from the technical performance of the produced architectural elements to the aesthetic and cultural potential of architectural form. This is addressed through the evaluation of the produced artefacts through out the process, but it also refers to the competencies needed, and the processes developed over a range of cases.