This jig is specifically designed to aid in loading and orienting the holders for 4" round leatherette coasters that are supplied by JDS.  Simply add the STL files into your slicer program to 3D print.  This is a two-piece jig that can either be glued together permanently or can be press-fit together and take apart for easier storage.  
 
This is a digital file only.  No physical product will be provided.