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Table 1 Mean absolute (mm) and relative (%) differences for 3D printed parts in comparison with the original PAPR

From: COVID-19 and a novel initiative to improve safety by 3D printing personal protective equipment parts from computed tomography

  Absolute CT (mm) Absolute caliper (mm) Relative CT (%) Relative caliper (%)
Part 1
 Ext. Large 0.15 0.58 .39 −1.89
 Ext. Small 0.45 0.15 .82 −0.47
  Int. Large   1.44   −4.01
  Int. Small   0.135   −0.49
  Height   0.99   2.09
Part 2
 Ext. Large 0.35 0.58 0.9 −1.52
 Ext. Small 0.2 0.1 0.65 −0.31
  Int. Large   1.545   −4.36
  Int. Small   0.37   −1.33
  Height   1.06   2.24
Part 3
 Ext. Large 0.1 0.425 0.26 −1.11
  Ext. Small 0.4 0.005 1.31 −0.02
  Int. Large   0.96   −2.67
  Int. Small   0.38   −1.37
  Height   1.005   2.12
Total mean Relative Difference 0.275 0.64 0.72 1.73