Rather than reinvent the wheel, I printed a radius jig that I found in Maker World and when they came out of the printer I realized a little organization would be nice.  I decided others might be looking for the same and made this simple tray to hold all the inserts and jig as well.  I have the values on the tray that I printed but will upload another file with no values so you can put the correct values for your set on it before printing, I also included an open slot as sometimes a custom radius is needed and can be stored with the set.  

I printed this in PETG but PLA would be fine.  No assembly is required and two STL files are included.  One file has values from the radius set I printed and one is blank so you can add your own values as needed.  The design includes 10 slots for the radius inserts and 1 jig slot.