Thinner Mask Retainer

I just cut some from the top and bottom of Arrow_Archer's model. This saves half the print time (33 min on Prusa mk3S instead of 68), and if you have short hair there's less plastic touching your skin.

Any infill above 20 or above is fine. I use PETG due to extra flexibility, but PLA may be fine.

This remix has no overhangs, so no need to use supports or raft.