Database of 3D crystal models
Joining @Karl's comment on «what do you want to do with them?» the work to present point groups is work already solved.  For off-line teaching, the freely accessible collection of the 32 point groups by Casas and Estop by (UB Barcelona) may suit your needs:

The model data are provided as interactive 3D .pdf files which a reader like Adobe Acrobat 9.0 may let you toggle on/off the axes / planes, etc.
Beside some background provided here, the authors outline the workflow and tools used (SolidWorks, Adobe Illustrator CS3, and Adobe Acrobat 9 Pro) in an accompanying publication (doi 10.1016/j.cageo.2013.09.004, paywall).  Later, the concept was extended to cover the space groups as to complement the International Tables of Crystallography, too (title page, paywall).