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KETpic is a macro package for Computer Algebra System (CAS) to convert plot data created by CAS to LaTeX picture data. We are able to draw fine pictures including 3D plots in LaTeX documents with aid of KETpic. We develop a graphical user interface (GUI) for producing 3D plots by KETpic. The GUI is implemented by Maplets package of Maple. Only small amount of input and mouse operation can produce 3D plots by the use of the GUI for KETpic. It is expected that the GUI helps many potential users of KETpic begin to use KETpic.