Tri-bladed Modular Boomerang
Schm4704's Tri-Bladed Boomerang is too large for my print-bed so I decided to chop the blades off and my Modular Boomerang was born.
Boomerangs were originally invented in Australia as a hunting weapon so they are definitely not a toy! Always fly yours in a suitably large safe area and consider eye protection and gloves. Children should be supervised.
Three bladed boomerangs are suited to intermediate skilled throwers and provides a compromise between best distance and the ease of having your boomerang come back to you.
If you are a beginner then you should consider my four bladed boomerang thing:3678915.
For experience throwers, see my two-blade boomerang thing:3679523.
The blades are interchangeable. Only the hubs are different.
Update: I replaced the hubs to give a 2 degree twist to the blades which provides more lift. I think that these fly better than the originals which held the blades flat.
To print your boomerang you need to make three blades and one hub.
You can scale the models to any size that you like. I include files for a small 250mm diameter boomerang (which should print on any 3D printer), a regular 350mm diameter (requires a minimum print bed length of 150mm) and a large 400mm diameter (requires a minimum print bed length of 170mm).
I include Leftie files for left-handed throwers.
As with any model which has a large contact area with the print bed you need good print-bed adhesive. If you have a heated bed then set it a few degrees higher than the recommended temperature to prevent warping.
Use a maximum 0.2mm layer thickness to keep the top of the boomerang smooth.
You need to make the boomerang as heavy as possible so that it will fly well. Print it solid with plenty of top and bottom layers. Set infill to 100%.
Flying your boomerang
The blades should clip tight into the hub however you may wish to glue the joints to stop movement of the blades. Before gluing the joints, you can make small adjustments to the angle of the blades to get different flying characteristics.
There are a number of sources on the internet which show you how to throw your boomerang. Here is one I found on boomerangs.com. The holes in the end of the blades are so that you can rivet metal into the holes for extra weight if needed.