PSI - Issue 83

Miloslav Kepka et al. / Procedia Structural Integrity 83 (2026) 138–145

143

Fig. 6. Visible waves caused by recoater vibrations.

Recoater streaks occur when physical contact between the blade and the part causes mechanical damage, specifically chipping of the recoater blade. This results in longitudinal streaks along the recoating path. A similar defect occurs when larger debris, such as detached support fragments, becomes trapped, typically in brush-type recoaters, resulting in similar streaks.

Fig. 7. Recoater streaking caused by recoater blade damage.

Missing powder may appear during the printing of complex geometries with rapidly changing cross-sections, such as the opening and closing of cellular support structures, or at the edges of complex features.

Fig. 8. Missing powder caused by support structure geometry.