Wendy, If you are new to incorporating technology into the classroom I would start with Skype rather than 3D because it is more user friendly. You can perhaps assign a "warm up" presentation in which the student books a brief Skype session with you prior to in-class presentations and you can provide one on one feedback before the big day. Students could also record a video(a functionality on all smartphones) and upload it to a class portal or private YouTube channel for peer feedback in preparation of in-class presentations. Wishing you continued success in the classroom. Theresa Schmitt