This is a 3D printing project which I did in my spare time.
I had the idea to print some custom housings for my USB drives.
For the roller coaster cart, a lot of details had to be simplified or left out to make it 3D-printable and usable.
Below to the left is the second version and to the right, the first version.
And the end result:
The same idea was also used to create a USB flash drive in the shape of a coat hook.