Made this LEGO BB-8 model a few months ago, and I’m just finally getting around to putting out a guide for it. I got all the parts from “Pick-a-Brick” on the LEGO online store. (Be warned, they’re very slow about shipping, because all orders are hand picked). It’s a pretty quick and fun build if you can’t afford the new Sphero BB-8 droid.
Here’s a little stop motion I made with an earlier version of the model: