When researching toxicology with zebrafish it is necessary at a certain stage of their development to place the embryo in a well plate.
This was initially done by hand, with sad undergraduates. A previous device had been commissioned, but cost on the order of $250k and was the size of a refrigerator. On top of that it was unreliable and hard to calibrate.
We were hired by the lab to develop a small and affordable device to supersede the previous generation. I designed the many prototypes and learned a lot about mechanical design, GD&T, machining, and project development.
In the end we had a device that cost under $10k with a footprint of a little over a cubic foot.