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