This vertical bubble machine blows bubbles not horizontally, but upwards. I needed this for a project: a witch cauldron from which bubbles emerge, glowing in the dark by having UV-A LEDs at the edge of the cauldron and using a UV bubble fluid.

Normal bubble machines have to blow bubbles in a horizontal or nearly horizontal direction, because the bubble wheel has to be oriented horizontally, with the lower part in a tank of bubble fluid. I had different ideas to overcome this problem, and in the end took a "ferris wheel" like approach.

For building this, you'll need a small 5V geared motor and a 12V pc fan (I used a rather strong one and ran it on the same 5V as the geared motor that's turning the wheel). Just place the bubble machine into a tray containing the bubble fluid.

You'll find detailled instructions to building this in my "Magic Cauldron" instructable here: http://www.instructables.com/id/Magic-Cauldron-Blowing-Glowing-Bubbles/. See for yourself which of the connecting bubble wands you want to print -- just print eight of them and mix them as you like. For my magic cauldron I used smaller ones, but when using just the bubble machine my kid's love the bigger ones very much.

Here's a video of the Vertical Bubble Machine in action: https://youtu.be/LEh5ZPtCJjE Here's a video of the "Magic Cauldron", for which it was built: https://youtu.be/U5E8Jiy0ujM

And here you can see an interactive rendering of the machine to better understand how it fits together: http://a360.co/2aNOUte