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Scanning electron micrographs and energy dispersive x-ray spectra for particles emitted during testing of the XYZ miniMaker 3-D printer toy with PLA filaments: (a1, a2) translucent blue PLA, (b1, b2) clear yellow PLA, and (c1, c2) clear orange PLA. Note: colors of tags with elemental symbols are randomly assigned by computer software and do not imply differences in levels of elements.
