I had the Macap M4D and never really had an issue with pop corning as such. I do remember that there could be some variation in grind speed due to the hopper level but it wasn't really an issue.
The Robur my current grinder is the model fitted with an auger about the burrs to mitigate I guess the effect of hopper level and maybe to prevent this pop corning. I just fill it to the bottom of the hopper more or less and it isn't a problem. I think possibly flat burr grinders as they operate at a higher RPM are more prone to this effect of trying to eject the beans when the hopper level is low. On the Robur the movement of the beans, regardless of the level is in one direction, down. It tends to suck the beans down and it may be due to this auger and the low RPM of 500 RPM that the grinder operates at.
The Robur my current grinder is the model fitted with an auger about the burrs to mitigate I guess the effect of hopper level and maybe to prevent this pop corning. I just fill it to the bottom of the hopper more or less and it isn't a problem. I think possibly flat burr grinders as they operate at a higher RPM are more prone to this effect of trying to eject the beans when the hopper level is low. On the Robur the movement of the beans, regardless of the level is in one direction, down. It tends to suck the beans down and it may be due to this auger and the low RPM of 500 RPM that the grinder operates at.



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