by mechadense, published
A square shaped support tent!
You have a structure shaped like a "+"
which cannot be oriented in any way to be overhang-free
and bridging won't work either?
In that case this thing might help.
It spans a thinn square membrane at a choosen height
which supports your overhang.
This membrane can afterwards be easyly cut away with a knife.
Adjust it so that it correctly overlaps your model.