From Eagle CAD to SketchUp using eagleUp.
Having Fun!!!
Please check this websites,
Import 3D Files to Sketchup
.step files -> open FreeCAD -> convert to .stl or .dae files
Inside Sketchup import .stl or .dae
Select the complete, then "Soften Edges and Color".
Right-click on it: Soften / Smoothen Edges
Tick the Smoothen Coplanar checkbox
Add Colors,
Plug color: 255 251 232
Black color: 56 56 56
Purple color: 102 40 144
0x662890 traces: 0x9E3DE1
Gold color: 248 193 108
Import 3D Files to 123D Design
.step files can be directly imported
Other Tutorials
3D Tutorial: http://eagleup.wordpress.com/2011/08/09/import-step-files-for-your-models/
STL Export: http://www.guitar-list.com/download-software/convert-sketchup-skp-files-dxf-or-stl
3D CAD Export: http://www.iheartrobotics.com/2009/04/ecad-vs-mcad-round-1-fight.html