cable binder/zip tie cut-assistant

This is a little assistance-tool to cut a used cable binder in an easy way. Before you use the binder, tread it through the cutassistant so you have space to cut it after it is attached to something.
This design is not tested yet. Feel free to print and test it.
Thanks to http://www.thingiverse.com/whosawhatsis for the "pizza slice"-code from http://rocklinux.net/pipermail/openscad/2012-August/003170.html