Feature Based Tool Path Generation System for FDM

3D Printing is finding a lot of applications in daily life especially when it comes to prototyping, irrespective of the field in which it is being employed. Ze-Xian Low, et al [1] compared 3D printing techniques and conventional manufacturing techniques that can be used for membrane manufacturing. Spahiu, et al [2] described how 3D printing can be used in textile industry. Wong [3] reviewed the application of 3D printing in orthopedics. Abdul Azeez, et al [4] used 3D printing techniques for fabricating support for hand drop disorder. P Vivek, et al [5] used 3D printing to fabricate a low cost prosthetic hand with EPS foamed fingers.

Basic 3D printing machines are G-Code based.The G-Codes are listed in [6]. There are multiple ways in which these codes are generated. Starly, et al [7] extracted the geometry from STEP files and then sliced the geometry to generate toolpath. Udroiu, et al [8] reviewed Polyjet printing process for different applications. Donghong Ding, et al[9] reviewed good amount of literature relating to slicing of objects. The problems during generation of stl file and using them to generate the tool path for 3D printing, tolerencing methods are discussed. Various criteria based on which tool path is computed is also presented in the same paper. Marco Livesu, et al [10] reviewed various aspects of process planning relating to 3D printing. Various aspects involve solving problems during import of geometry, planning for 3D printing like orientation of the object, determination of use of supports and the way to be generated, selection of process parameters etc. Kao & Prinz [11] discussed a method to reduce the gaps and errors that are produced in 3D printing when printing objects with sharp corners. Pandey, et al [12] reviewed classification of slicing algorithms, the algorithms involved and tolerencing methods currently in practice. Siraskar [13] used octree technique to determine layer height for improving accuracy and reduce stair case effect. Lensgraf and Mettu [14] described an algorithm to reduce waste moves using the existing methods but also utilizing local dependencies between parts of the model to ensure that printing and movement in three dimensions produces the target model and is collision- free. G Q Jin, et al [15] developed an algorithms for generating zig-zag tool path using hybrid and adaptive techniques. Mateusz Wojcik, et al [16] generated a tool path for fused deposition process using Modified Zig Zag pattern optimized using GA. Yu-An Jin [17] developed a slicing methodology for generating tool paths for 3D printers based on FDM techniques taking surface accuracy and fabrication efficiency into consideration.