The list below links to 3D printing resources that you will find helpful, especially if you are starting with 3D design for 3D printing.
3D design software
The best 3D design software for 3D printing
Learn more about Tinkercad
How to create a 3D printable Valve Cap with Fusion 360
Learn how to design a battery cover
Learn how to design your own action figure
Browse through past design challenge to find inspiration and ideas of objects to create.
How to Scan the World
Get a 3D printer
Be a better designer by 3D printing out your own designs (compare 3D printers and prices here).
Check out the Wanhao Duplicator 9 (sold on MyMiniFactory).
How to get awesome photos of your finished 3D prints
3D Printing Content Trends Report
Battery cover design tips & tricks