This is an adaptation ofhttps://www.printables.com/model/36796-boomeranga boomerang.

I added 100% fill in the area closer to the throwing arm to achieve a better weight distribution. This added about 3 grams to the arm, which is close to the recommendation of the original creator to add a small coin. You can easily move, resize, or copy the 100% filled area to adjust the performance of the boomerang.