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This is a key process in the growing field of 3D printing, and works by setting down material in layers to form the final product. Monitoring can confirm the correct surface condition.

Deposition works on the principle of laying down hot molten plastic in layers which harden immediately after extrusion. The organization of these layers is determined by design software, and leads to the production of a three-dimensional product.

After each layer is deposited, the object moves down and the next layer is deposited on top, according to the programmed design. Once a product is removed from a 3D printer, its support materials are either soaked away or snapped off. This may leave surface defects behind. 

Since deposition can be a slow process, automated monitoring can detect defects at an early stage, allowing the process to be stopped if necessary. It also verifies the quality of the finished product, determining if further action (such as sanding or milling) is required.
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