Table 5.
Geometric mean (95% confidence interval) emission characteristics for XYZ brand toy miniMaker 3-D printer extruding three colors of PLA filament at a constant extrusion speed (n = 3; 1 printer × 3 replicates/printer)
| Metrica | PLA/translucent blue | PLA/clear yellow | PLA/clear orange |
|---|---|---|---|
| ELPI yield (#/g printed) | 3.8 × 107 (1.5 – 9.6 × 107) | 6.1 × 106 (0.2 – 1.6 ×107) | 8.5 × 106 (0.3 – 2.2 × 107) |
| SMPS yield (#/g printed)* | 3.5 × 107 (2.2 – 5.6 × 107) | 4.5 × 107 (2.8 – 7.2 × 107) | 3.5 × 106 (2.2 – 5.7 × 106) |
| ELPI size (nm) | 174.2 (138.6 – 218.9) | 147.9 (117.7 – 185.8) | 202.3 (161.0 – 254.3) |
| SMPS size (nm)† | 54.9 (50.8 – 59.3) | 39.9 (37.0 – 43.1) | 48.7 (45.1 – 52.6) |
| TVOC yield (μg/g printed)‡ | --b | 11.5 (6.9 – 19.0) | 4.4 (2.7 – 7.3) |
a
ELPI = electrical low pressure impactor; SMPS = scanning mobility particle sizer; TVOC = total volatile organic compound
b
TVOC levels near or below photoionization detector instrument detection limit which precluded calculation of yield value
*
= clear orange significantly different from translucent blue and clear yellow filaments (p < 0.05)
†
= clear yellow significantly different from translucent blue and clear orange filaments (p < 0.05)
‡
= clear yellow borderline significantly different from clear orange filament (p = 0.055)