Single dose hopper works great and bellows help significantly reduce retention. He was even able to print the product in white for me. Can’t recommend enough.

The grinder itself is pretty great for the price point, but it does have some slight retention. With the bellows, all that is taken care of!! You are able to get every last gram from your grinder! 100% worth getting 🙌🏻

I found out about this company through a YouTube comment, and I'm thankful that I did. The wider hopper and bellows are a welcomed addition to my coffee workflow—no more tapping the hopper with my palm to get the last bit of grinds out. Looks & functions great

I was super stoked to find that a product like this exists that allows me to upgrade my Macap Leo 55 grinder instead of having to sell it to buy a single dose grinder. This is a welcome addition for anyone trying to streamline their workflow, reduce waste and minimize retention. The funnel and bellow combo looks smart (see photo), and it’s much easier to work with than a full hopper.

These bellows fit the Niche Zero 1 perfectly and really work well. There is absolutely no retention after using them and they are a really great price. Delivery to the UK was really quit. I thoroughly recommend them

Excellent quality, great feeling

The bellows makes it so much easier to get rid of the retained ground coffee. In combination with the BeanGlide cover, I no longer have to poke beans out of the finger guard or bang the grinder to dislodge the grounds. Highly recommended if you don’t store extra beans in the hopper! Since I regularly switch between espresso and filter beans, I’ve been single-dosing for a long time. I had to cut down the hopper to fit in my space and Andrew was very helpful in deciding if that was a good idea.

캐나다의 wdt 툴에 진심인 제작자 분의 introvert 칠침봉! 벌써 12번째 칠침봉...😱 고급진 알루미늄 바디에 0.35mm 침 7개 평행구조. 대부분의 칠침봉들처럼 침 상단의 굵은 부분을 하단이나 상단에서 꽉 맞게 끼우는 것이 아닌, 바디 윗부분의 넓은 홀로 침을 떨궈주고 헤드를 잠궈주면 단단히 고정되는 방식입니다. 알루미늄 바디가 주름형이라 그립감이 아주 좋습니다. ^^ 스탠드는 하단에 고무가 있고 밀폐형이라 침이 외부에 노출되지 않아 주변에 떨어지는 커피가루가 거의 없어 깔끔!
●
평행 구조의 침인데도 사선형 침 구조인 세컨드랩이나 놈코어처럼 솎기가 쉬우면서도 바깥쪽과 안쪽을 같은 길이의 침으로 wdt 가능합니다. 추출 양상은 0.3mm 침 9개가 사선형인 놈코어 칠침봉 대비 2~3초 지연되며 채널링 또한 훨씬 적은 편. 사선형 대비 바스켓 하단에서 상단으로 올라오면서 wdt하는 속도와 분배력이 대단히 뛰어납니다!
●
에스프레소 추출 후 아메리카노와 카페라떼로 비교 시음 결과 전체적으로 놈코어 칠침봉 쪽과 구별하기 쉽지 않았어요. 아메리카노에서 산미톤과 밀도가 살짝 높게 느껴졌으나, 카페라떼에서는 거의 차이 없음.
💛
외부형 도징링과 사용시 바깥쪽과 안쪽 침의 길이가 다름에 따른 미세한 wdt 효율성을 높이기 위한 구매였는데 매우 만족스러운 칠침봉이네요. 유일한 단점은 배송비가 무료임에도 10만원이 넘는 가격.😱 물론 그에 맞는 내구성과 마감, 쾌적한 작업속도와 wdt 효율은 그를 상쇄하고도 남습니다. ^^

10/10 products. packaged with care, delivered on time, and does exactly what it’s supposed to do in the best way.

Now my Virtuoso+ is complete 🤩

Andrew provides an outstanding, well designed and engineered product in a very timely manner. His communication is equally outstanding. I would highly recommend Introvert!

I use my kalita wave to rdt and shake the beans before loading into the zerno and this makes pouring the beans way easier.

I have a Vario W+(purchased 2024), grinding medium roast for pour over. The hopper feeds all beans and no beans popcorn out of the hopper(20g dose). When using the stock hopper for single dose, a few beans would always hang up on the bottom lip of the hopper. I would then have to brush them down, while grinding.

The bellows is a perfect fit and clears the grinder with two or three puffs. I was retaining .5 to 1.0 grams before using the bellows. I think the item description of 0 to 0.2 grams of retention using the bellows is accurate.

Referencing the photos on the website item page. My hopper is different, having the printing seam lining up with the index mark/narrow lug. Index mark aligns with where the shutoff knob/lever is on the stock hopper. The photo with the hopper filled with beans on a scale is weird. On a Vario, just plan on leaving the hopper installed.

The latest, silicone release of the INTROVERT bellows for the Breville Sage grinder is a big improvement on the previous 3D-printed version. The old-design bellows was already a great addition to the grinder, easily attaching to the hopper and significantly reducing retained grounds and the annoying last few dribbles after you grind. But the material from the 3D printed version was a bit stiff and it looked and felt less than professional. The silicone version blends seamlessly with the design of the grinder so that you'd never know it didn't come stock. I also no longer worry about wearing the material out with excessive use. The silicone has very smooth action and takes a very light touch, so there's no more splattering grounds all over the place. Its a really clever addition to the grinder and I'm very happy I upgraded to it.

I wasn’t sure about the claims made by the author about the efficacy of this tool, and only bought that tool, because it looked more sturdy than my previous no-name WDT tool from Amazon. Boy, was I wrong.

The previous tool was a challenge to evenly distribute the puck. The Introvert one makes WDTing a breeze. The puck becomes even and fluffy with little effort. The resulting coffee is also decent. I regret not buying this sooner.