Every time I filled up my Miata, I had nowhere to put the gas cap, so I designed a 3D-printed holder to keep it secure. I sold a few of V1, a simple version without magnets, at a local car meet.
V2 was the first version with magnets. I sold all 10 through Instagram DMs, and that demand is what pushed me to build my own store, thesoyventure.com.