I was experimenting with CAD and wanted to make something similar to the Pull-Copters I teach my students to make.

I tried a few different methods to model this one.  The fact is, this is still a work in progress, but I had fun making it and I wanted to share.

NOTE: I designed this in the morning on 11/17/2023.  

I 3D printed it in the afternoon, and now I'm sharing it with the world.  

I am loving this hobby!

I will likely be working on this model a bit more. 

I want to add a bit more support to the “Lid” where it meets the spinner, so it is held more securely.  I am also considering a method of connecting the top and bottom parts of the spinner using a set of external clips instead of screws, but I haven't quite figured that part out yet.

For now I just used a few small wood screws I had in my toolbox to put this together.  I imagine you could also use a piece of 1.75mm filament and melt the ends over to hold it together. That said, you would want to use a strong and light string through the spinner part because you have to split it in half to put the string through. Yes, I should grind down the screw points, No I haven't done it yet.  I used one of the strands out of a piece of parachute cord I already had. (melt the ends over so it doesn't fray apart!)

In future versions I also plan to make a larger ring for bigger fingers.  This one is more for kid size fingers.

I printed the Top with the socket side up and used tree supports… If I was going to do it again, I would print it with the socket touching the build plate instead and use the tree supports on the upper surface of the top instead, this would make a smoother surface for it to spin on.  Even as rough as this one turned out, it still spins for about 40 to 50 seconds with a good pull.

I printed the ring with the flat surface facing down and used support underneath it.  This can be a bit tricky to remove, I recommend using a small flat-head screwdriver and giving it a tap, it pops off pretty easily.