by alan_one, published
This is an improvement on my old yo-yo design, http://www.thingiverse.com/thing:39356
The main improvement is that this design allows two small panhead screws to be used to hold the yo-yo to the axle; the previous design relied on friction. In this design, the screws sit nicely in their own countersunk hole. A cutout on the outer face of the yo-yo provides room for you to put, say, a 3d printed medallion or other decoration.
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The axle is made by cutting a 25mm long piece of 1/4" hardwood dowel. This will give you a 3mm string gap; you can cut a different length according to preference.
As with the other yo-yo, you can mess with the print density to determine the weight of the yo yo. I find that with PLA, around 75% infill gives a density similar to wood.
Unlike the previous design, this yo-yo can only be assembled butterfly style.