We have successfully printed headbands on the Prusa i3 MK2S printer in both PLA and PETG. At 0.25mm layer height, printing two face shields takes 6hr30m. Adjusting the layer height to 0.35mm reduces the print time to 4h15m, but there is some sagging in the top of the visor.
Recommended Material: PLA or PETG/CPE
Alternate Materials: ABS, ASA or Nylon
Graphical representation of top/bottom layers, outer shell & infill:
https://www.3dhubs.com/knowledge-base/selecting-optimal-shell-and-infill-parameters-fdm-3d-printing/
Additional Notes:
Click to Enlarge - 1 image(s)