I am a contributor of instructables.com, a really great website for skills sharing. They run competitions with brilliant prizes and they are currently running a competition around plastic.
The top prize is a 3D printer. All you have to do is share something you have made with photos and instructions on the subject of plastic. Maybe you already have a build process documented that you could post. There’s only 13 days left of the competition so be quick!
Here’s the link: