I have made many hexie bed quilts by hand.
Have used both paper and plastic ..The plastic is so much better..I only hold the material to hex..I never glue or pin..It works just as well that way..Less work all around..Also have always done the corner folded..Didn't see how to do hexiest before making them..just thought it made sense that way.I only use 3 hexiest at the most..so the plastics last forever..as far as cost goes.
The paper loses its shape after used some..which makes the hex untrue in shape.In my opinion ...people I have taught all want the plastic after trying the paper..