Hello Mat,

you have to install the extensions. You will find a complete setup here: http://moi3d.com/forum/index.php?webtag=MOI&msg=7777.762

After install, means copy the containing folder under ui ans set up a short key, start the nodeeditor and load the node file. You can also only use one of the extensions.zip in the thread and copy the containing files under the extensions folder. Make a sweep of your main/big circle without cap ends. After that select it and go to the nodeeditor. Now select the selected node with the right mouse button and choose update. The node should show a "1". Then press run. Adjust the radius of the circles and the number. That's it.

Good luck!
Karsten