Has anybody else experienced trouble getting larger beans to feed through the auger of the Guatemala Lab? When grinding small dosages (18 - 33 g) of larger beans like our Sumatra, we've been experiencing popcorning of a prettty significant fraction of the coffee for as long as five to ten seconds after grinding would normally finished. We've found that turning the grinder off for about a second can lower the auger speed enough for the larger beans to feed through.
But not only have we been dealing with popcorning, we've also been seeing significant buildup of large fragments around the auger when grinding several dosages of larger beans back to back. If the buildup becomes great enough, it sounds almost like there's a little piece of plastic stuck in there. I would estimate that there is as much as a gram and a half stuck in there at times. Grinding smaller beans usually clears it out pretty well.
Has anybody else experienced this problem with the Guatemala Lab, or Mahlkönig Guatemalas in general? Do you have any suggestions? If anybody knows of an affordable single phase frequency drive, we may be able to alleviate the popcorning more cheaply than if we were to buy a new grinder.
Below is a photo showing the size of the problem beans and a sample of the fragments I dug out of the auger.