This is the extruder die I made for making hollow glaze test tiles.  This extruder die is made specifically for the Frema hand held extruder as that is what we have in the school.  The die is 57 mm in diameter 2.25 inches.  The hollow forming part is needed for the frema extruder for this die to work.   I will attach a video shortly of it in use.  
 
This is an updated version of the extruder die I made a couple of years ago for our glaze eutectics wall.  This one is a little narrower and I was able to make test tile shape work for both our hand held extruder and our wall mounted extruder.  Depending on how many tiles are needed we can use the wall extruder or the hand held extruder and the tiles will be the exact same.  
 
Print settings aren't fussy.  I printed ours using PLA, .6 nozzle, layer thicknes .2, 40% fill