Framework Spheres - Large, Medium, Small
This is in STL to make it adaptable - if you want to laser cut export as SVG from something like tinkercad - it's meant to be cut from 3mm basswood but it can easily be changed to suit what you need
You can find a video about this here https://youtu.be/wf9LMMxNnY0
you will also need a packet of 6mm by 30mm dowels or a length of 6mm dowel rod