Extrusion-based additive manufacturing process for producing flexible parts

  • Narendra Kumar
  • Prashant Kumar Jain
  • Puneet Tandon
  • Pulak M. Pandey
Technical Paper


The processing of elastomers through fused deposition modeling (FDM) is challenging task due to low column strength and high melt viscosity. Ethylene vinyl acetate (EVA) is an elastomer which is widely used for fabricating flexible objects. However, the potential of this material has not been explored in the FDM process. Pre-fabricated EVA filament cannot be processed in standard filament feed extrusion mechanism of commercial FDM machine due to buckling of the filament. However, development of pellet-based extrusion additive manufacturing (AM) may eliminate the issues caused by elastomer filament. The current study demonstrates the development of pellet-based AM system for processing EVA material. The developed system is compatible with the three-axis CNC milling machine, which provides high precision positioning to the deposition path and required power for screw rotation. Details about hardware and software related to the developed system have been presented. Flexible parts using EVA pellets have been fabricated successfully, which shows the capability of the developed extrusion AM system. Experiments have been performed for tuning process parameters. Further, mechanical characterization has been done to analyze the dimensional accuracy, flexibility, strength and hardness of printed parts. Obtained results show that EVA demonstrates approx. 300–550% higher elongation as compared to ABS and PLA materials, which indicates EVA can be used to make highly flexible parts. The outcome of this study will be helpful to the engineers for the development of low-cost flexible parts for those applications where customized flexible parts are needed in short span of time.


Elastomers Ethylene vinyl acetate Additive manufacturing Fused Deposition modeling Pellets Flexible parts 



This work is carried out under the DST-SERB sponsored project “Development of Additive Subtractive Integrated RP System for Improved Part Quality” (SB/S3/MMER/0043/2013). Authors would like to thank DST-SERB for providing financial support.


  1. 1.
    Gibson I, Rosen D, Stucker B (2013) Additive manufacturing technologies. Rapid Manuf Assoc, Second. Google Scholar
  2. 2.
    Kumar N, Shaikh S, Jain PK, Tandon P (2015) Effect of fractal curve based toolpath on part strength in fused deposition modelling. Int J Rapid Manuf 5:186–198. CrossRefGoogle Scholar
  3. 3.
    Shaikh S, Kumar N, Jain PK, Tandon P (2016) Hilbert curve based toolpath for FDM process. CAD/CAM, robotics and factories of the future. Springer, New Delhi, pp 751–759CrossRefGoogle Scholar
  4. 4.
    Taufik M, Jain PK (2013) Role of build orientation in layered manufacturing: a review. Int J Manuf Technol Manag 27:47–73Google Scholar
  5. 5.
    Magalhães LC, Volpato N, Luersen MA (2014) Evaluation of stiffness and strength in fused deposition sandwich specimens. J Braz Soc Mech Sci Eng 36:449–459. CrossRefGoogle Scholar
  6. 6.
    Singh S, Singh R (2016) Some investigations on surface roughness of aluminium metal composite primed by fused deposition modeling-assisted investment casting using reinforced filament. J Braz Soc Mech Sci Eng. Google Scholar
  7. 7.
    Turner BN, Strong R, Gold SA (2014) A review of melt extrusion additive manufacturing processes: I. Process design and modeling. Rapid Prototyp J 20:192–204. CrossRefGoogle Scholar
  8. 8.
    Elkins K, Nordby H, Janak C, et al. (1997) Soft elastomers for fused deposition modeling. Solid Freeform Fabrication Proceedings, Sept 1997 (pp. 441–448)Google Scholar
  9. 9.
    Xiao J, Gao Y (2017) The manufacture of 3D printing of medical grade TPU. Prog Addit Manuf. Google Scholar
  10. 10.
    Bellini A, Shor L, Guceri SI (2005) New developments in fused deposition modeling of ceramics. Rapid Prototyp J 11:214–220. CrossRefGoogle Scholar
  11. 11.
    Wang Z, Liu R, Sparks T, Liou F (2016) Large-scale deposition system by an industrial robot (I): design of fused pellet modeling system and extrusion process analysis. 3D Print Addit Manuf 3:39–47. CrossRefGoogle Scholar
  12. 12.
    Volpato N, Kretschek D, Foggiatto JA, da Silva Gomez, Cruz CM (2015) Experimental analysis of an extrusion system for additive manufacturing based on polymer pellets. Int J Adv Manuf Technol 81:1519–1531. CrossRefGoogle Scholar
  13. 13.
    Taufik M, Jain PK (2016) A study of build edge profile for prediction of surface roughness in fused deposition modeling. J Manuf Sci Eng 138:1–11. CrossRefGoogle Scholar
  14. 14.
    Jin YA, Li H, He Y, Fu JZ (2015) Quantitative analysis of surface profile in fused deposition modelling. Addit Manuf 8:142–148. CrossRefGoogle Scholar
  15. 15.
    Standard test methods for vulcanized rubber and thermoplastic elastomers—tension. Annu B ASTM Stand i:1–14.
  16. 16.
    Francis V, Jain PK (2016) Experimental investigations on fused deposition modelling of polymer-layered silicate nanocomposite. Virtual Phys Prototyp 11:1–13. CrossRefGoogle Scholar
  17. 17.
    Sefadi JS, Luyt AS (2012) Morphology and properties of EVA/empty fruit bunch composites. J Thermoplast Compos Mater 25:895–914. CrossRefGoogle Scholar

Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  • Narendra Kumar
    • 1
  • Prashant Kumar Jain
    • 1
  • Puneet Tandon
    • 1
  • Pulak M. Pandey
    • 2
  1. 1.Mechanical Engineering Discipline, CAD/CAM LabPDPM Indian Institute of Information Technology, Design and Manufacturing JabalpurJabalpurIndia
  2. 2.Mechanical Engineering DepartmentIndian Institute of Technology DelhiNew DelhiIndia

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