I wanted some bubble-making tools for entertaining toddlers, and I didn't want to run to the store, so I made these. For bubbles, I used a one-to-one ratio of dish soap and water. The wands worked great, particularly when I put them in front of a fan. I printed both with and without raft (printing using ABS on Afinia/UpPlus2 printer), and both worked fine for me. I don't know if the ridges make a difference or not. The one with larger ridges didn't seem to create any more bubbles per dip in the soap, but I didn't do any scientific measurements.