The typical Nespresso machine is an OEM manufacturing gem: it contains a badly mounted pump in some hard plastic casing that is so cheap they could given them to you for free. One effect is that despite not being free, machines are still affordable. But another effect is that as long as the machines work, usually a few weeks into the post warranty period, the cup holding tray grilles rattle so much that the cup slides off the grille, or at least so much off center (as seen from viewpoint of the freshly brewed coffee) that the stream of coffee misses the cup, or drips on its rim.
One way or another, you want to keep the cup in place.
Flat sheet rubber does not work because the rattle or vibration has an amplitude that is too much for normal thin sheet rubber to contain the motion.
But it works when one uses small rubber bands.
I use small rubber bands for my prosthetic hook, and having an extra one lying around I figured it was thick enough to significantly dampen the vibration. Turns out it works, and, it has worked (now) for three months. The little pink rubber (shoved into the grille) now prevents the cup from sliding off the tray.
