This is a variation of Blue Buddha Boutique's tutorial, in AA and rubber. Usually, the rings connecting the barrels are the same size as the rings in the barrels. Because I wanted 3 complete sections of rainbow, I made the connectors smaller.
A few HP 3-1 stretchy bracelets I made for myself. The top 2 were some of the first pieces I ever made. Bottom 4 are alternating weave directions made a couple of days ago. Note the difference in size. They all have the same number of rings. Shows that they will stretch out over time.