For the moving part project I chose to make a mallet with a detachable handle. I used a cylinder for the top and then a socket inside of it which attaches to the ball handle piece. I got this on my first try and I made the ball handle just a little bit smaller than the socket and it worked.
For the 1 of the 20 objects I chose the penguin. I made his arms going up so I wouldn’t need support underneath them and added glasses. His beak is made out of the peace sign with the fingers turned to look like an open mouth, and flippers for feet. Came out nicely with some extra around the edges and worked the first try.