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.

good good

This little bellows does a great job of helping to clean out the fine dust and residue that remains in the Niche after each grind. I was amazed the first few times I used it to just give a little tap and see a puff of coffee come out of the grind chute. It is now an essential for me.

The material of the bellows looks and feels to be high quality and it feels like it can be compressed and distressed without any damage to the bellows, so I feel like I will be using this particular bellows for multiple years to come.

Upon having the tool in hand, it was plainly extremely well designed amd manufactured. I have used it for about 2 months now with daily prep of 2 to as many as 10 cappuccinos, lattes, mochas, and americanos for family and friends. It became equally plain that the research into the optimum needle diameter and arrangement paid off in developing a tool that actually works as intended. Kudos and thanks are due to Introvert.

The bellows works great! No more banging the lid and shaking the grinder to get the all the beans. Seller was responsive and item was shipped quickly.

Nice seller! The bellow solved 100% the retention issue! Totally recommend!

I bought these bellows for a Niche Duo Grinder. even with the strikes the bellows arrived quickly. Great packaging and a great product.
I was amazed at how much they removed on the first use, it gets less dramatic with later uses as there is less to remove.
I could not be happier with this product!
Thank you!

I have been looking for a single dose hopper like this for a good bit of time. It is very well-built and works exactly as expected.

The bellow works and feels very nice and high quality.

The shipment to Sweden was very easy and straightforward. Blew my mind how well it worked.

Excellent product!

As advertised- excellent!

Great combo that I wish I would have moved to long ago on my old 10 y/o Vario. Although the Vario with the steel brewing burrs is a fantastic grinder the old school design and tall height isn't exactly counter space friendly. The single dosing hopper certainly helps a bit in that regard. The bellows work really well for me and help remove those annoying last 0.5g or so that always seems to be lurking inside. Love the product!

Way less popcorning, way less retention. Its great!