A plethora of additive manufacturing methods have emerged over the years. These can be categorized into two groups. The first group is the layer-by-layer process, in which a computer-aided design (CAD) model is converted into a set of instructions that creates the desired parts . After an initial print in a layer, additional layers are added in order to construct the final part. The entire process is then repeated for the next set of layers. The layer-by-layer approach is the simplest process, but is limited to printing parts made of one material. The second group is the direct ink writing (DIW) process, which was introduced in 2004 . This process involves the deposition of successive layers using a heated print head. The most notable DIW 3D printer is the Objet Connex 500 printer (Figure 2). As seen in Figure 2, this device contains four print heads, which print with one of the following materials: polylactic acid (PLA), nylon, acrylonitrile butadiene styrene (ABS), polyethylene terephthalate (PETG), and polycarbonate (PC). The print heads (Figure 3) are connected to a high-pressure injection valve (model CP750; 3D Systems, Rock Hill, SC, USA) that deposits the material in the form of droplets. The entire system is housed in a pressurized chamber, which allows a fine layer to be printed within seconds.
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One of the drawbacks to this approach was that we needed to recompile every time we made even a small change to the code. This slowed everything else we were doing down and because we couldn't always have someone waiting for the application to finish building. 827ec27edc