Summary

i used the customizer to make a 5-hook-key-hanger and imported the resulting .stl-file into sketchup (with this plugin http://sketchupdate.blogspot.co.at/2013/01/stls-for-3d-printing-in-and-out-of.html ). then i cleaned the model up ( with this plugin http://sketchucation.com/forums/viewtopic.php?t=22920 ) and edited the hooks to add a bit of slip-of-safety (sketchup file available for download). afterwards i exported to .stl and did a check and repair on the .stl ( http://cloud.netfabb.com/ ).

the different color are realized with a fillament change after the printer starts to draw the symbols.

thanks to KyroPaul for the customizable version this is based on.