Table 3 Results of the observations of microplastics retained in the filter housing after tests.

From: Design, manufacturing, and testing of 3D-printed fittings for ergonomic helmet CPAP devices: a case study

Sample number

Number of microplastic elements

Minimal size [µm]

Maximum size [µm]

PET-G No.1

24

57 × 93

535 × 194

PET-G No.2

20

41 × 41

358 × 437

PET-G No.3

10

51 × 57

207 × 181

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