During an Open House event for the Branham Innovation Center (BIC) at Rose-Hulman I was introduced to a Man whose son has Spina Bifida. He was looking for some way that he could enable his son to strengthen his leg muscles before corrective surgery, so that he could learn to walk.
However, all of the existing options weren't quite what he wanted, and also cost multiple thousands of dollars.
The project was then given to me, and I managed to have a working model out to them for a total cost of about $20, which is a fraction of the cost of any alternative.