Insert cp-yoyo-axle.stl into cp-yoyo-a-side.stl with the thread going in first. Press until hex side mates with coupler.
Insert cp-yoyo-b-side.stl onto cp-yoyo-axle.stl. Hold cp-yoyo-axle.stl while twisting cp-yoyo-b-side.stl tighten and reorient until ports of both sides are lined up.
Hold cp-yoyo-axle.stl in place while applying super glue to the hex side. Hold together until glue full sets.
Untwist the end of the yoyo string and place it over the axle. The loop should slip into a grove on the center of the axle.
Insert the male JST connector and thread it into cp-yoyo-b-side.stl. Then, thread it through the cp-yoyo-axle.stl piece and pull it through cp-yoyo-a-side.stl.
Orient USB port of circuit playground with hole on cp-yoyo-a-side.stl. Then, lay circuit playground PCB onto the standoffs and press down until pegs snap into pins.
Plug in the male JST connector from lipo battery into female JST connector. Insert slide switch into clips on the side of cp-yoyo-b-side.stl.
Use a piece of mounting tack and stick it on the back of the lipo battery. Stick the lipo battery to the surface of cp-yoyo-top-b.stl. Press down on battery to secure it in place. Twist cp-yoyo-top-b.stl onto cp-yoyo-b-side.stl until fully tightened.
Place finger over gap between halves and partially wind up the string. Remove your finger and then wind up the whole string. Now it's ready for a test spin!
I was able to get the yoyo to sleep for about 4 seconds until it came to rest. This should give you enough time to do some basic tricks like walk the dog or even rock the cradle.
You can load up any NeoPixel sketch to make cool designs, try out this Kaleidescope code for some motion-activated lights!