Twist with egg crate slot
This model is a corkscrew shape which is designed to gently twist and un-twist into 1/2 inch holes, which is a common hole size in many frag racks. Made for OceanBox Design's magnetic frag rack, but will work with others too. Contains a slot to wedge onto egg crate.
There are 2 files, one has a support built in for FDM printers (like Makerbot and Lulzbot), the other is support-less if you want to add your own or have one of those fancy-pants SLS printers. We highly recommend printing this with a brim so it stays attached during printing.