gottebp@jkufsky Strange! Google "BES870XL Impeller" and see what I mean. Does yours look different than that? Maybe not all of them are stainless or something. Anyway, if you go for replacement, checkout the BES860 commentary left by others on the ifixit page first: https://www.ifixit.com/Guide/BCG800XL+Grinder+Jamming+due+to+Worn+Impeller/62905
It is a lot more work to get at than the BCG800XL and the impeller itself requires drilling out the center hole to make it round.
gottebp@jkufsky I think the BES870 impeller has stainless-steel-cladding and does not wear out like the plastic one. The ShapeWays impeller part probably does fit, since it fits the BES860XL. If the impeller is steel as I suspect, I think it's worth investigating other avenues first such as drier beans, or tightening the nut on the internal torque limiter.