近年來「3D列印」是一個很熱門的新議題，它提供大眾將想像化為實體的可能性，在個人工作室中常被用來進行創新產品的的開發應用。而為了因應大型3D列印機的數量少、價格昂貴，且僅有單一積層方向較難對下方中空的物件進行成型等問題。所以本文將著手於FDM（Fused Deposition Modeling）成型技術的大型3D列印機開發，並搭載第四軸旋轉平台以利改變積層方向的成型。
在機台研製上使用線性模組的伺服控制系統作精準的軸向移動，並選用方便於機電整合程式開發階段的嵌入式控制器NI myRIO對擠出機、加熱裝置作控制，最後再由電腦端的LabVIEW介面程式整合伺服控制與嵌入式系統，達到3D列印的機台控制功能。
列印成品影響的參數很多，測試不同硬體環境、切層設定、模型設計，尋求最適合FDM積層成型的相關列印設定。
最後根據不同列印需求，可將機台的大尺寸列印平台更換成第四輔助旋轉軸平台，切層軟體與旋轉軸的搭配應用，讓其具備一般3D列印機沒有的積層方向改變功能，可以對原本需要額外增加支撐材料的物件直接列印成型，節省支撐材料成本且讓列印成品有不同積層結構的特性。

In recent years, "3D printing" is a very popular new term, it provide people possibility of turning imagination into reality. 3D printer often used in personal workshop for development of innovative products. Because the market demand of large-scale 3D printer is low, so it is expensive and rare. The basic concept of 3D printing is deposition of layers, with only a single direction of deposition, it is difficult to build the hollow model. So this paper will focus on development of large-scale 3D printer by FDM (Fused Deposition Modeling). Furthermore, the 4th rotation axis is equipped for facilitating the change of direction of deposition.
Servo control system with linear modules for axial movement is used in the development, embedded controller NI-myRIO is chosen due to easiness of programming for controlling extruder, heater. Finally, program a user interface including servo control and embedded system to achieve a 3D printer’s control functions by LabVIEW.
Printing parameters will affect production, testing with conditions such as different hardware environment, slicing setting, model design find suitable print settings on this paper’s printer.
According to different printing desire, the large-size printed platform can be replaced with the 4th rotation axis platform. With combination of slicing software and rotation axis, allowed direction of deposition can be changed. The original model which need additional support material to build can now be built without support material, with changing direction of deposition, that finished product has the different direction of deposition structure, also reduce costs of supports.

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