Amazon.com: Ultra Stealth 750-Watt 3 Jar Mixer Grinder, 110 ...

The black part that spins is made of cheap plastic and if the blender blade gets stuck, the wears out leaving black residue. There is a replacement part but in order to change it out you need to remove the bottom panel.

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Amazon.com: NutriMill Classic 760200 High Speed Grain Mill ...

A Classic High-Speed Mill Milling For Everyone The NutriMill Classic was designed for daily use in your home. Because it is a high-speed impact mill it creates large amounts of flour quickly.

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