This Case for the Anker Soundcore will redirect your audio and give it a tinny effect, though it won't necessarily amplify it inherently.  Cutouts are made so you can still access all ports and buttons.

For assembly, you'll need to print 1X for parts A,B,D,E, & F, and 2X for Part C. All pieces are designed to fit together with tension, although I ended up reinforcing mine with superglue so your mileage may vary. 

Parts E & F require supports, while the rest can print support-less.

For this specific model of speaker.