Influence of bed temperature on warpage, shrinkage and density of various acrylonitrile butadiene styrene (ABS) parts from fused deposition modelling (FDM).

This research aims to investigate the influence of bed temperatures on various acrylonitrile butadiene styrene copolymer (ABS) parts produced from Fused Deposition Modeling (FDM). The Printing process was conducted at a fixed nozzle temperature of 240°C while bed temperatures were varied from 90°C, 100°C and 110°C. Part shapes were varied accordingly to examine warpage, shrinkage and density due to variation of part thicknesses separately. Changes in the glass transition temperature of ABS printed parts with different bed temperatures were examined using Differential Scanning Calorimetry (DSC). It was found that the warpage and shrinkage reduced with increasing bed temperature due to the reduction of thermal stress with a higher glass transition temperature of printed samples compared with its filament. The thin sample indicated pronounced shrinkage compared with thick sample due to lower thermal contraction in the thicker sample but the former was less affected by the variation of bed temperature. Samples of different heights with fixed infill density indicated variations of the trend of density with different bed temperatures. [ABSTRACT FROM AUTHOR]