Suggestions for Research Project Ideas for STEM

I have a research coming up and it has to be under the theme of STEM (Science, Technology, Engineering or Mathematics) I am completely stuck on what to do and how i could possibly go about on actually researching a two term project. We have access to 3D printer and I guess I could design an app or something like that. Some of my interests that I could somehow link to the area of STEM include psychology, Agriculture, Architecture and design. Any suggestions would be much appreciated. Thank you!