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Do all burr grinders statically-electrically–charge the grinds, or do only the faster-operating ones do this?
Krups GVX212 burr grinders are notorious for producing statically-charged grinds that stick to the plastic hopper:
Do all electric burr grinders produce statically-charged grinds, or does it depend upon the grind speed* or other factors?
*The Krups GVX212 does 20g in ~30 seconds.
Yes, "Different grinders, coffees, and environments may produce more or less static" ("Reducing Static in your Grinder").
According to "Stop Coffee Grinder Static with RDT," "you'll get more static during the drier months or with darker roasted and therefore drier beans".
The "Ross Droplet Technique (RDT)" was pioneered in 2005. Basically, you stir the beans in or spray them with a small amount of water, immediately before grinding. The water reduces static but does not clog the grinder.
Coffee grinds are insulators. There are several methods of discharging insulators (Assis, Experimental and Historical Foundations of Electricity vol. 1, §7.14 "How to Discharge an Electrified Insulator?"):
Wait. The insulator will discharge over time. (ibid. Experiment 7.29)
Submerse the insulator in water. (ibid. Experiment 7.30)
Hold a flame near the insulator. (ibid. Experiment 7.31, first discovered by the physicist William Gilbert, 1544-1603)
