Printed this Part in Flex PLA
Turns out to be slightly softer than the original but unbreakable with good dampening.
Only needs support at the horizontal screw-holes. I solved this via "support enforcer" option in my slic3r software.
Survived already some hard bashing sessions, i am quite happy with the result.
I suggest to try out ABS for more stiffness.
don't know FLEX PLA
print flex PLA slower as PLA but same temperature.
my print was sticking like hell to the bed, try stick-glue as intermediate layer for easier removal from bed.