At Lenovo designed a custom 2 fan RAM cooler specifically for high capacity modules. Required thermal design, testing, and monitoring to tweak design. Design currently in Lenovo's workstations.
A custom drone attachment that allowed for transport of small sensitive emergency medical supplies.
10M views on replicating a design from MIT. Using 3d printing and CAD.
On an alternative note this should have been injection molded.
Drone attachment that augments drone's onboard GPS with a substantially more accurate version. Develop enclosure that can be injection molded while also reducing weight.