I designed a "Maker Coin" container using OpenSCAD. This coin has a threaded lid that screws in. It doesn't hold much, but it is fun to play with and hold in your hand.

I was inspired by these YouTube videos:

Maker's Muse: https://www.youtube.com/watch?v=tGtNLpYSXOU&t=0s

3D Printing Nerd: https://www.youtube.com/watch?v=Kv1xYpV_yS4

I used the Sine Thread library from mingofmongo to design this part. It is a much faster library than the other thread library. It makes designing objects with threads much more fun. Renders take less than a minute instead of 20 minutes.

Sine Thread: http://www.thingiverse.com/thing:261244

If you print it, I'd love to see a picture. Enjoy!