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Improved model and experimental validation of deformation in fused filament fabrication of polylactic acid

Progress in Additive Manufacturing volume 3, pages 193–203 (2018)Cite this article

Abstract

RepRaps (self-replicating rapid prototypers), which 3D print objects using fused filament fabrication (FFF), have evolved rapidly since their open-source introduction. These 3D printers have primarily been limited to desktop sizes of volumes of ~ 8000 cm3, which has limited the attention of the scientific community to investigating deformation of common thermoplastics such as polylactic acid (PLA) used in FFF printing. The only existing physically relevant deformation model was expanded here to use a physics-based temperature gradient instead of a step function. This was necessary to generalize the model to 3D printing in a room temperature environment without a heated chamber. The thermal equation was calibrated using thermal measurements and validated by measuring curvatures in printed objects. The results confirm that this is a valid model for predicting warpage of thin vertical walls of PLA. In addition, the effect of annealing was examined. It was found that at a temperature of 50 °C, no shrinkage or crystallization takes place, but at 90 °C the PLA rapidly crystallizes to around 20% crystallinity. This indicates that heated bed temperatures should be maintained at 50 °C or lower to avoid print failure (premature substrate release) with PLA. At 90 °C, the annealing is accompanied by a 5% size decrease in both horizontal dimensions, but an 8% increase in the vertical dimension. Thus, the volume decreased by only 3%. This observation may lead to potential methods of improving slicing of printing large PLA objects with FFF.

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Acknowledgements

The authors would like to thank Dr. Edward Laitila, Gerald Anzalone, Mark Klein for their help and discussion, and thermoanalytics for the use of the IR camera.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI, 49931-1295, USA

    Bas Wijnen, Paul Sanders & Joshua M. Pearce

  2. Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, USA

    Joshua M. Pearce

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  1. Bas Wijnen
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  2. Paul Sanders
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  3. Joshua M. Pearce
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Correspondence to Joshua M. Pearce.

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Wijnen, B., Sanders, P. & Pearce, J.M. Improved model and experimental validation of deformation in fused filament fabrication of polylactic acid. Prog Addit Manuf 3, 193–203 (2018). https://doi.org/10.1007/s40964-018-0052-4

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  • DOI: https://doi.org/10.1007/s40964-018-0052-4

Keywords

  • Fused filament fabrication
  • Fused deposition modeling
  • Deformation
  • 3D printing
  • Poly lactic acid
  • RepRap

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