http://repos.fedorapeople.org/repos/jebba/reprap/

1. Copy fedora-reprap.repo to /etc/yum.repos.d/fedora-reprap.repo
2. yum clean metadata
3. yum install openscad repsnapper repsnapper-gtk2

I am working on getting these packages into mainline Fedora:
OpenSCAD
OpenCSG
repsnapper

repsnapper-gtk2 is the development branch of repsnapper.