In a four-member team, we designed and built an adjustable and reusable mandible cutting guide for mandibular reconstruction surgery to replace custom 3D printed guides (example) so that the lead time of the surgical planning can be reduced, and intra-operative surgeries can be performed.
In a team of five, we developed a creative idea of using a bi-stable tape spring to achieve grasping. We selected this concept because it is non-motorized, cheap to manufacture and can provide a good amount of grasping strength. 
In a six-member team we designed and constructed a remote controlled model fireboat which equipped with propulsion system and pressure system for pumping water. 
In a six-member team, we created a model vehicle with regenerative braking for better energy efficiency. 