Rove Foam Roller
I did the initial product architectur and engineering for the product.
It's a foam roller...
And it folds flat...
Tiny Proto Testing
As a sanity check model this was great. I used off the shelf metal dowels pin and printed the parts in house. COGS = $30. I think I will start building mini versions of every product I work on. You learn so much and it's a great keepsake.