I did more testing and found that the residue is coming from the basket, not the spring.
Residue is more prominent at yellow arrows, caused by friction between the basket and the handle. And residues do fall into the handle (blue arrow).
What's causing friction between the basket and the handle you ask? Well, my theory is the handle and the group head gets so tight that when the baskets comes in contact with the gasket, it causes the basket to not turn with the handle, thus any contact between the basket and the handle will have friction. I can certainly feel metal rubbing against each other when locking and unlocking the handle, and I'm certained it's not coming from the locking mechanism.
The amount of residue is of course minimal and have less chance of being ingested if you dismantle and wash your portafilter every run, but it's getting produced nonetheless. I also don't think users should be expected to do that.
One other BES920 user is already noticing this, so it's not just me.
Residue is more prominent at yellow arrows, caused by friction between the basket and the handle. And residues do fall into the handle (blue arrow).
What's causing friction between the basket and the handle you ask? Well, my theory is the handle and the group head gets so tight that when the baskets comes in contact with the gasket, it causes the basket to not turn with the handle, thus any contact between the basket and the handle will have friction. I can certainly feel metal rubbing against each other when locking and unlocking the handle, and I'm certained it's not coming from the locking mechanism.
The amount of residue is of course minimal and have less chance of being ingested if you dismantle and wash your portafilter every run, but it's getting produced nonetheless. I also don't think users should be expected to do that.
One other BES920 user is already noticing this, so it's not just me.


Have a good life.
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