A slightly rounded version to reduce pressure on the hand. Per sewist feedback, this remixed is tampered. I rapidly print this for sewists making masks in response to COVID-19.

For quickest/still strong printing (on PrusaSlicer 2.2.0):

Be sure to do a Z calibration and make sure your first layer is correctly calibrated: https://help.prusa3d.com/en/article/first-layer-calibration_112364/

Print 10 instances, parallel to x-axis.

Print settings
Layers and perimeters
Perimeters: 2
Solid layers, Top: 3

Infill
Fill density: 10%
Fill pattern: Cubic

Speed
Perimeters: 100 mm/s
Small perimeters: 50 mm/s
External perimeters: 70 mm/s
Infill: 250 mm/s
Solid infill: 250 mm/s
Top solid infill: 100 mm/s
Gap fill: 0 mm/s (disable)

Setting adopted from Maker's Muse:
https://youtu.be/3kW9SnK4LKc

Prusa

i3 MK3

No

No

0.3

10%