This is a fragment of rht-MOF-9, a copper-organic crystal complex.
The .stl file needs to be scaled up. For M3D printers a factor of 50x50x50 is good.
Include on-model supports just in case.
Opened the .xyz molecule file in Visual Molecular dynamics (VMD)
Set graphics as desired
Render .stl file
Upload .stl to Microsoft Netfabb
Take fixed .stl file and use with printer.
Adjust size as desired.