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Rhino IFC Tools
The IFC3dPrint command looks to aid converting IFC files into a format in-which is suitable for 3D printing.
After selecting the command, It will prompt you to pick an IFC file, a printing scale and minimum thickness (defaults to 2mm). It will then prompt you to write out an IFC file with the substitutions.
You can import that into Rhino, and scale it down using the standard rhino commands as required.