This part is a mounting plate to connect the fan shroud of the diamond hotend to a standard mounting (pulley) bracket for a M3D Crane series printer. As far as I can tell, this appears that it could also fit the Creality series brackets for an Ender or CR10 printer.
I printed in PETG for durability.
No preference PETG
Part should import in correct orientation. 3 holes are closed at top of nut recess to eliminate need for support and will need to be opened after printing.