If an Opus 1 was relatively tidy and suddenly starts throwing more grounds around the cup, Fellow’s current support guidance points to the grinder’s anti-static pins and exit chute before any modification.
Where are the anti-static pins?
They sit around the inside of the exit chute and can be difficult to see when coffee buildup covers them. Fellow explicitly notes that if the pins are not visible, heavy buildup itself may be contributing to the mess.
How do you clean them?
Remove the catch cup and brush/swipe around the inside of the exit chute using the Fellow brush or another clean non-abrasive brush. Fellow also says blowing out loose coffee can help clear the pins.
Why do dark roasts need more cleaning?
Fellow says darker/oilier coffee increases buildup and clog risk. Its current clog guide also notes that finer grind settings can generate more static.
Should you immediately add more RDT?
No. Clean the grinder’s built-in anti-static system first. Fellow does support RDT/light spritz for Opus 1, but maintenance and RDT solve different parts of the problem.
What if the grinder is also clogging?
Move to Fellow’s clog procedure. Minor clogs can sometimes be cleared at setting 11 while tapping/bellows actions are used; major clogs require unplugging and cleaning the burr chamber. Do not turn a static article into an improvised teardown.
| Symptom | First move |
|---|---|
| Suddenly messier after many cycles | Brush exit chute / anti-static pins |
| Dark/oily coffee | Clean more frequently |
| Pins not visible | Remove heavy buildup |
| Grounds no longer feed / chamber clogged | Use Fellow clog procedure |
References
- Fellow — Opus 1 anti-static stopped working
- Fellow — clean and maintain Opus 1
- Fellow — Opus 1 clog procedure
Revision note: this article is Opus 1-specific; Opus 2 has a redesigned grind path and should use its own support instructions.