an extremely obscure device designed to attach to a motor for the purposes of spore sampling, for those who need one, you know exactly what it is and it is a perfect fit and replacement part for the aluminum impinger bar that essentially costs nothing to print.
in my field, it is in high enough demand that i would rather be able to print them instead of machining them out of aluminum for the exact same purpose.

the normal length of the impinger bar is 12", this one is 9" to fit on the bambu build plate.