Abstract
Abstract This work investigates the difference in impact response of sheet extruded vs 3D printed Polyethylene Terephthalate Glycol (PETG) and High Impact Polystyrene (HIPS). The effect of a machined notch vs a 3D printed notch, the effect of the raster angle, and the role of percentage infill are also examined. IZOD impact energies at temperatures ranging from −50°C to 50°C in 5°C intervals are experimentally obtained for 3D printed and extruded specimens. 3D printed specimens tested had 25% infill, 100% infill, 60° raster angle, 90° raster angle with machined and 3D printed notches. For a 90°-raster angle, increasing infill percentage from 25% to 100% may increase the impact strength of 3D printed PETG and HIPS by 20% and 42% respectively. These gains do not seem to occur for a 60°-raster angle, neither were these gains consistent for machined notched specimens. 3D printing PETG or HIPS will generally result in materials whose DBT regions will have slopes up to 70% gentler than their sheet extruded counterparts. An increase in raster angle from 60° to 90° may reduce the DBT slope by up to 60% for either material. If an adjustment of the DBT slope is sought by altering the infill percentage for these 3D printed materials, careful attention must be paid to the raster angle used.
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