This is the interior pieces for a 1:4 scale Disk II floppy drive, familiar to anyone who owned an Apple II in the 80s. The size and details of this piece, combined with the shell (https://www.shapeways.com/product/R4S2W3BNS) and the guts of a generic SD Card reader, make an excellent addition to your workstation or desktop.
Fully functional, painted and finished models are available for purchase from my etsy store:
https://www.etsy.com/shop/RetroConnector