it takes a little bit of practice. but is easy to do.
used Nespresso capsule
thin aluminium foil
* use and old pair of scissors because cutting aluminium foil makes them really blunt.
Step 1: Clean the Used Capsule
wash/ rinse the capsule and let dry.
Step 2: Fill With Espresso Ground Coffee
pack it into the capsule tightly.
Step 3: Clean Rim
if you do a sloppy job, it will leak.
Step 4: Place Foil Over Capsule
I have used heavy duty aluminium foil with poor outcomes. try using cheap light duty aluminium foil. better yet, chocolate wrapper aluminum foil works best.
the aluminum foil is an important detail because you want the pressure in the capsule to build up and rip the aluminum foil.
Step 5: Crimp Foil
use you fingernail to crimp to the underside of the rim. there edge of the foil should NOT touch the cone portion of the capsule body.
if the foil is too large, you won't have the proper seal and hot water will leak around the capsule.
Step 6: Brew
Step 7: Brew Either Small or Large Cup
the refilled capsule makes a full shot.
Step 8: Post Brewing Analysis
the foil size is crucial.
the coffee is packed very tightly with very little give when pressed.
the back gets punctured by 3 pins in my machine. this capsule has been used several times already.
clean out the capsule and reuse.
Step 9: Cost Analysis
a can of espresso ground cost average of $10 for 250 grams.
that's 31 capsules of coffee per can. cost of 30 cents per capsule.
this is a savings of 30 cents per capsule compared yo the nespresso capsule.
experiment with different brands.