A holder for practice locks. The other holders I found on Thingiverse were way too small to fit my locks, so I made my own. There are tabs that prevent the locks from sliding out without some effort. The center plug snaps into place for storage and transport, or you can insert it from the back and it will provide a secure way to hold the entire assembly with a vise or act as a kickstand.

Make sure to use supports for the main holder.

The center plug can be scaled up or down by 1% on the X and Y axis for a tighter or looser fit, although on my printer it fits perfect at it's current size.

This was designed for lock cylinders with a diameter of 16mm and a riser (pin housing?) width of 6mm.