GoPro - Helmet Extensor
https://www.youtube.com/watch?v=26-G9azr_B8&feature=youtu.be

Nozzle size - 0.3 mm
Layer height - 0.1 mm
Shell thickness - 0.6 mm
Fill Density - 60%
Bottom/Top thickness - 0.2 mm
Nozzle temp - 240°C (Material: ABS)
Bed temp - 83°C

Speed.
Travel - 150 mm/s
Bottom layer - 40 mm/s
Infill - 65 mm/s
Top/bottom - 40 mm/s
Outer shell - 40 mm/s
Inner shell - 55 mm/s

Support type - Everywhere
Estimated Time - 6 hs