A low-poly version of one of my boomerang designs (https://www.printables.com/model/36796-boomerang) for the current low-poly competition. Print with about 25% infill and reasonably many solid layers and walls (I suggest 5 of each at .2 mm layers/.4 mm nozzle).

Throw not too high, about 45 degrees to the right of the wind and with a bit of layover. Must be mirrored for left handed throwers!