This post will fit the mounting holes for Kitchenaid mixer attachments (e.g. whisk, beater, etc.). I attached it to the underside of a cabinet with Command strips, and used it to hold the attachments vertically. It may work to hold the attachments horizontally, too, although I haven't tested it.
Update: I originally printed this in HIPS, and I've had one of the hangars break along the Z-plane. I'm going to try re-printing it in nylon, but you might have to print more perimeters for added structural integrity.
I used Meshmixer to generate support for the perpendicular locking post.