Jack Pop's Cola Mentos Fountain

🇺🇸 English version below ⬇️

Screw-on attachment for standard 1.5 liter and 2 liter Coke bottles, with which you can recreate the classic kitchen experiment
https://en.wikipedia.org/wiki/Soda_geyser

Holds up to 9 Mentos and seals completely, so that all the pressure goes into a nice tall fountain (approx 5-6 meters). 🐳 There are four different versions, which only differ by the hole at the tip. Size S produces a longer-lasting fountain, but partially atomizes. XXL makes a thick jet and was always my first choice.

You can see them in action here: 

🧲 This version works magnetically: The Mentos are held by a 20mm washer from the hardware store and kept in position from the outside with a magnetic clip. When the clip is pulled away, the washer and Mentos drop down. The clip is suitable for 12x5mm magnets. I had to search a bit to find good quality ones that are strong enough to hold the Mentos through the filament: https://amzn.to/4mOHrgn

(Amazon affiliate link: If you order via the link, I receive a small commission. However, no additional costs arise for you).

✅ Tested with original Coca Cola Light and Coke Zero. I have not tested discount brands, where the thread might possibly be slightly different.

🤝 The thread used in the model is remixed from this fantastic model, a thousand thanks to Ohrenstoepsel for the preliminary work:
https://makerworld.com/de/models/90669-pet-thread-pet-thread#profileId-109717

https://makerworld.com/de/@ohrenstoepsel

I made it minimally smaller, by 1mm. That resulted in a tighter grip around the bottle neck for me and completely seals the bottle at the bottom. Tip: The attachment must be pressed onto the bottle thread once with some force (i.e., pressed straight down vertically) before it can then be screwed on. I would recommend testing it once with an empty bottle, then it will work a bit more smoothly on the second screw-on.

Have fun recreating it!

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🇺🇸
Screw-on attachment for standard (German) 1.5 liter and 2 liter Coke bottles, letting you recreate the classic kitchen experiment.
https://en.wikipedia.org/wiki/Soda_geyser

Holds up to 9 Mentos and seals completely, so all the pressure goes into a nice tall fountain (approx. 5–6 meters). 🐳 There are four different versions, which only differ by the hole at the tip. Size S produces a longer-lasting fountain but partially sprays. XXL makes a thick jet and was always my first choice.

You can see them in action here: 

🧲 This version works magnetically: The Mentos are held by a 20mm washer from the hardware store and kept in place from the outside with a magnetic clip. When the clip is pulled away, the washer and Mentos drop down. The clip fits 12x5mm magnets. I had to do a bit of searching to find good-quality ones strong enough to hold the Mentos through the filament: https://amzn.to/4nlz6Ro

(Amazon affiliate link: If you order via this link, I get a small commission. For you, there are no additional costs).

✅ Tested with original Diet Coke and Coke Zero. I didn’t test with discount brands, where the thread might be slightly different.

🤝 The thread used in this model is remixed from a fantastic design — huge thanks to Ohrenstoepsel for the model:
https://makerworld.com/de/models/90669-pet-thread-pet-thread#profileId-109717

https://makerworld.com/de/@ohrenstoepsel

I made it minimally smaller, by 1mm. That gave me a tighter grip around the bottle neck and sealed the bottle completely at the bottom. Tip: The attachment needs to be pressed down onto the bottle thread once with some force (pressed straight down vertically) before it can be screwed on. I’d recommend testing it once with an empty bottle – then it will go on more smoothly the second time.

Have fun!