Instantly create custom beverages with the Flavor Mixing Straw! With around $10 in parts from the hardware store, you can turn three drinks into nine (correction: SEVEN. see comments) by turning a few valves.

Step 1: Parts & Tools

Picture of Parts & Tools


1. 1/4" OD vinyl tubing (about 3' in length)

2. 3X 1/4" OD plastic quick-connect MIP straight valve

3. 1X 1/4" OD plastic quick-connect tee

3. 1X 1/4" X 1/8" plastic quick-connect C X MPT adaptor


1. Hand Drill

2. Scissors

ElijahB36 months ago

great now i'm thirsty

ElijahB36 months ago

great now i'm thirsty

cburgess7x1 year ago

the amount of murica is to d*mn high

this is SO awesome
JON-A-TRON (author) 1 year ago

The valves are basically ball valves, so there is some control of how much flow you have, though they're intended for off/on usage. If you really wanted to get fancy, you could make little paper dials to fit under the valve handles with percentages on them. Another cool thing you could add to this project is some kind of bottle holding caddy.

How are there 9 flavors?

If each valve can only be fully on or fully off, there are two possibilities for each (on, off), so 2^3 = 8 combinations, but since one of them is all straws off, there are really 7 possible flavors.

If each valve can be partially on/off, there are many more, only limited by the smallest amount each valve can be adjusted.

To extrapolate, these would be the combinations:








The last 3 aren't really combinations though, just the original drinks by themselves.

JON-A-TRON (author)  NitroRustlerDriver1 year ago

Ha! Thanks for the correction guys. I didn't expect a project this simple to be scrutinized so carefully. Next time I'll do the math before I make such outrageous claims.

but which is it? Can the valves be adjusted in small increments to find the best combination of flavors? If not, maybe it'd be a nice enhancement for the future.

askjerry1 year ago

Ok... that's original... love it!

FleX_DK1 year ago

This is so silly - and I love it! Definitely a must build.

MMMMMM flavor mixing......

JON-A-TRON (author)  audreyobscura1 year ago

You know this!

xGrape1 year ago

Awesome idea! Multiple straws/split straws is nothing new - but the valves are - and that makes all the difference. Lovely update to an existing idea. Kudos!

JON-A-TRON (author)  xGrape1 year ago

Thanks xGrape! It's a fun 10 minute project to keep around for parties.