Tutorial videos to learn Tinkercad: https://goo.gl/lUWhrq
Making & 3D printing by Tinkercad: https://goo.gl/iWpt4x
The famous character of maker fair.
The robot was drawn by Illustrator and made 3D modeling by Tinkercad.
If you can make SVG file, you can print any shape of stamp easily. The video is helpful.