快速原型系統是將不同基材以層層堆積的方式製作出所需的產品，因為成形的原料不同，主要分為固態成形、液態成形、與粉末成形三大類。本研究使用的溶融沉積面成型快速原型系統(Fused Deposition Modeling,FDM)屬於固態成形，使用高分子線材做為原料，經過加熱後依循需求路徑擠出，路徑經過層層堆積後即可得到成品。由於成本低廉、操作容易、並且不產生化學性毒氣等優點。主要應用於模型製作與成品預覽方面。然而缺點是使用的高分子線材無法在列印過程中替換，所能列印出的顏色數量取決於噴頭的總數，且打印中使用的路徑加工檔案G-code是由STL檔案經切層程式後產生，兩者皆不具備色彩資訊，所以難以印製成彩色模型。
為了克服這兩點，本研究以溶融沉積面成型快速原型系統為基礎，在硬體上，設計串聯機構增加噴頭數量讓單個模型能由多種顏色的線材進行列印。軟體上，使用自建立又C/C++語言開發之G-code處裡介面軟體，將切層過後的G-code檔案經過程式分析後模擬出每一層的路徑軌跡，然後針對想要改變顏色的特徵輪廓作出顏色標記後輸出一個具有彩色路徑資訊的G-code檔案以達成本研究目標。

The rapid prototyping system is to produce the required products by stacking different substrates in layers. Because of the different raw materials for forming, it can be divided into three major categories, solid-state forming, liquid-state forming, and powder-state forming. In this research the rapid prototyping system of fused deposition modeling(FDM) is belong to solid-state forming. It use polymer wier as a raw material, after heating, follow the demand path to extrude, and the product can be obtained after the path are stacked layer by layer.
Because of the advantages of low cost, easy operation, and no chemical gas generation. The rapid prototyping system of fused deposition modoling is mainly used in model making and previewing of finished products. However, the disadvantage is that the polymer wire used cannot be replaced during the printing process. The number of colors that can be printed depends on the total number of nozzles, and the path processing file G-code used in the print is generated by the STL file after the slice process. Both of G-code file and STL models do not have color information.Therefore it is difficult to print into a colorful model.
In order to overcome these two difficulties, this reaserch is based on the rapid prototyping system of fused deposition modeling, improving hardware and software to reach the research goals. On the hardware, designing connection structure to increase the number of nozzles allows a single model to print by using multiple colors of wire. On the software, Use the G-code interface software developed from the C/C++ language to analysis the G-code file and simulate hole path during printing layer by layer. Then mark features on required contour, produce a new G-code file with colorful path information.

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