LBRY just announced a small 3D printing and 3D design contest with cryptocurrency rewards. Here is the summary:
Design a chess set that sparks our imagination & win $100 in cryptocurrency. Upload your chess set design (use a zip folder for multiple files) in either STL or OBJ format to the LBRY (library) network. Once finished, email the lbry:// address (automatically receive 10 Library Credits for your first upload) to firstname.lastname@example.org by July 4th.You can win 100 USD for the first place and 50 USD for the second place paid in LBC cryptocurrency.
Here is the link to the full post with detailed contest rules: https://lbry.io/3d-contest