correct me if i'm wrong, but this isn't really universal. you have to print different parts for each size spool you have?
how about making the triangle sides a little bigger (to get the spool up in the air) and then you only have to print 3 rods.
make the size of the rod fit the small spool hole (because it would also fit a larger spool hole.)
that would then be more universal because any size spool will fit on these without the need to print specific size.
awesome design though.