You mentioned the black cover is available again, but it's still on unavailable. Where can I find it?

On this product page, choose the "Aluminum Cover" for this single dose hopper, it is in stock now.

How many grams whole beans can the hopper hold?

This hopper is designed to be used with a single dose (20 grams), enough for one shot of espresso from an espresso machine (they usually cost over $1500 for this use-case). And then to use the squishy silicone accordion thingy to push the rest of the beans out using air to ensure precise amount of grinded beans in the portafilter for consistent shot times. If you are trying to buy this instead for cool looks or low-profile to fit under cabinet, I'd say enough for 5 cups (100g total). if you are doing pour-over, Id say enough for 2 cups.

I'm trying to blow everything but still getting about 1g retention. Why?

Most grinders have some degree of grounds retention. Generally dark roast coffees (my preference) are more oily, so there will be some retention. The single dose hopper does very well, but sometimes I use an old chopstick in the grounds shoot to knock out any retained grounds. Also, it helps if you use a product like GRINDZ to clean out your grinder.

ASIN	B09PZZ166T
Best Sellers Rank	#255,497 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #43 in Manual Coffee Grinders
Brand	CAFEMASY
Colour	Single Dose Hopper
Customer Reviews	4.5 out of 5 stars 213 Reviews
Enclosure Material	Aluminum Silicone
Item Dimensions L x W x H	7.9L x 7.9W x 10.7H Centimeters
Item Weight	0.23 Kilograms
Manufacturer	CAFEMASY
Material	Aluminum Silicone
OutputCapacity	80 Grams
Power Source	manual
Recommended Uses For Product	Cleaning and collecting coffee grounds
Specific Uses For Product	Coffee Grinder
UPC	779880592775

Coffee Grinder Single Dose Hopper for Eureka Mignon Grinder Coffee Grinder Accessories Hand Pressure Silicone Bellow to Clean and Collect Coffee Grounds for Commercial Burr Coffee Grinder

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