Uptake by SAEC of 3-D printer-emitted particles collected in the cell culture medium. SAEC were treated with medium containing 3-D printer emissions for 24 h, followed by TEM image analysis. (A) Control, (B) Background, (C) 100% PC, (D) C inset, (E) 100% ABS, and (F) E inset. A, B, and C images are at 2,000x magnification, and image E at 2,500x magnification. D and F images are at 15,000x magnification. A, B, C, and E scale bar at 2 μm; D, F scale bar at 400 nm.