Summary I sliced the boomerang for the smaller printers. You can scale it up to your printer maximum range! Use ABS and acetone to stick the pieces together. 2015_10_15 -> added a scaled version that fits an UP plus 2 (140 mm diameter) Note; A boomerang can be dangerous for the unattended! Printed over more than 15 cm in diameter it can cause serious harm! ( age 10+)