My group and I worked on a project that involved 3D printing something we thought was going to be useful to use. So, we decided that a phone holder would be useful for those who like to watch Netflix, YouTube, etc. on their phones.
The process to print it took about 2 hours. It can fit all phone sizes from the iPhone 5 to a Samsung phone to an iPhone 7 Plus.
There are many different possible shapes and sizes, we decided to go for a small, portable one in the shape of a dragon. However, there are many that are also capable of being 3D printed.
Here is an example of another type of phone holder:
Here is our phone holder: