I wanted to make a symmetric, omega-style boomerang, so here it is. Throw with a bit of layover and, as always, if the boomerang is warped downwards or flies too low, bend in some positive dihedral - the wingtips should be slightly above the table if the boomerang lies flat.

My first prints have 7 perimeters, 5 top and bottom layers at .2 mm layer height, and 30% infill. They fly some nice medium-range circles.