Mask Head Harness

##Respirator-style head harness for masks.
- Relieve the pressure on ears.
- It feels more comfortable than the ones around neck.
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- Can be printed on 200x200 bed diagonally.
- Bend it into shape when taking it off with warm bed temp.
- Tested with PLA. Any rigid filament should work.

###Stacked print:
- I only tested 0.4 nozzle at 0.3 layer height. Please feel free to share your settings.

###Updates:
- v1.2 Update 2020-04-06: Hook shape improvement. Easier to take off if caught long hair.
- v1.3 Update 2020-04-08: Taller ellipse for stability improvement. Added stacked model.
- v1.4 Update 2020-04-13: Made the hooks wider. Added a smaller version.
- v1.5 Update 2020-05-02: Made the gaps between hooks smaller. The bands are harder to get out.