Introduction: Mentos Geyser Tube: Re-Make
Step 1: Gather the Stuff You Need
Materials:
- PVC 1/2" coupling tube (x1) ~ $0.15 @ local home improvement store
- PVC 1/2" end cap (x1) ~ $0.30 @ local home improvement store
- Two litter Coca Cola cap (x1) ~ free
- Paper Clip (x1) ~ free
- Small cord ~ free
- Dremel (+ drilling bits + cutter)
- Pencil
- Loctite Super Glue
- Duct Tape
Step 2: Drilling the Cap
Take the 1/2" coupling tube and center it on top of the bottle cap. With a pencil, outline the inside of the coupling tube on the cap. Hold the cap with a pair of plier and you can now machine the cap following the outlines with the Dremel cuter tool. File the chips with the Dremel for a nice finish.
Step 3: Drilling the PVC End Cap
Hold the 1/2" end cap with a pair a pliers and drill a hole on top of the PVC end cap. The guys at Eepybird, in their great tutorial, recommends drilling holes sizes 1/8" or 1/4". You can try drilling one hole only, or more than one hole, or a slot pattern.
Step 4: The Release System
- The first one is the most classic one: drill two aligned 1/32" holes perpendicular to one end of the 1/2" coupling tube, on each side, where you will then put a paper clip. The setback of this system is that the Coke, in the process, will also escape from these little holes.
- The second one works very well too and is more "leak proof": instead of a paper clip, it is using two small magnets (on outside the 1/2" coupling tube and on inside). For this system, instead of drilling small hole, you'll have to machine the coupling tube in order to flatten the tube and thus make a stable base for the magnets.
Step 5: Glue All the Pieces Together
Now that all the parts are machined, you can glue them together with the Loctite Super Glue. First the PVC end cap to the PVC coupling tube, and then the bottle cap. Within a few minutes, everything should be sturdy. You can use some duct tape if you like for an even stronger finish.
Step 6: Experiment !
- Insert 5 mint Mentos into the geyser tube and lock them with the release system (paper clip or magnet)
- Place the Diet Coke bottle in a large outside open space (parking lot, etc.)
- Open the Diet Coke bottle and carefully screw the loaded geyser tube to it.
- Make sure no people or animals are in the line of fire, and trigger the release system with the help of the small cord
- Enjoy !

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12 Comments
10 years ago
Can you use sprite?
15 years ago on Introduction
I love it, how about some pictures of it in use?
Reply 10 years ago on Introduction
Here are some pics just a few years later. ;-)
Not the same but similar.
14 years ago on Introduction
how about a clip of it in action
Reply 10 years ago on Introduction
Not the same but similar.
14 years ago on Introduction
do you have too use diet
Reply 10 years ago on Introduction
No. It does not have to be diet but diet is not as sticky to clean up. I left the soda on the brick and it never got sticky.
10 years ago on Introduction
This is a great idea!
10 years ago on Introduction
Thanks for this one!
It seems to me that the magnet approach requires remembering to fish out the interior magnet from the bottom of the Diet Coke bottle, right? And given a strong enough magnet on the outside, I suspect "machining" the PVC tube won't be strictly necessary.
I am planning to give this a try with a strong magnet on the outside and a 1/2" ball bearing on the inside.
14 years ago on Introduction
dude if u like this stuff and funny vids go 2 you tube and type in pork and beans by weezer its hilarious
14 years ago on Introduction
i built one from 1 inch pvc but it didnt work
15 years ago on Introduction
Very Cool! Great Instructable!