Fracture toughness of fused filament fabricated plastic parts were characterized using ASTM D5045-14. Based on the results following suggestions were made: 1. Notch radius should be 20 μm or less (preferably a sharp crack should be initiated); 2. For geometrically non-similar samples, relative notch length (a_0/W) should be between 0.45 ≤ a_0/W ≤ 0.55 3. For thinner specimens that exhibit nonlinear P vs d, a J-integral approach (J-R curve, ASTM D6068) is recommended.
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