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ESEM images of the ABS surface roughness: (a–c) before laser irradiation; (d–f) after green laser irradiation in focus; (g–i) after green laser irradiation 0.8 mm out of focus. Magnification: (a) 2800× scale bar 30 µm; (b) 24,000×, scale bar 3 µm; (c) 80,000×, scale bar 1 µm.
