Try it out: http://whatshouldi3dprint.com/
A lot of new 3D Printer owners get overwhelmed about what to 3D Print next because there's thousands and thousands of designs online.

What Should I 3D Print.com is a random idea generator for 3D Printing.

It's a website with thousands of personally handpicked, curated designs.

So, if you want some ideas on what to 3D Print next, try out What Should I 3D Print.com to find a cool design.