Butterfly Yo-yo with 625 Bearing

Here is my take on a printable yo-yo. I wanted a butterfly style yo-yo with a bearing to allow for better spin.

I designed this mostly for a metal 625 bearing, it will certainly work better that way, but if you don't have one handy. There is an included model of a printable 625 bearing that works too. 

You'll need a 20-25mm long M3 screw to assemble. There are three different models for the versions, one is opened up to allow a 3mm screw to pass. That side is paired either with a side that uses an M3x5x4 heatset or a side that is undersized to allow the screw to self tap. I am using the heatset versions to allow for more reliable disassembly and reassembly.

This ends up being a reasonably light yo-yo so I would print this with plenty of perimeters for when it crashes into something and I would use modifiers to print the outer 6mm or so of the rim with 100% infill to get a little extra inertia. I've included an 3MF that shows how I did that for my prints.

I also recommend printing with partially bridged counterbores enabled in your slicer, or adding in designed bridges for the counterbores.

Libre license and FreeCAD files included so you can modify as you see fit, just make sure to share it with the community.