Spool hub for 1.25" ID spool

Simple, fast-printing hub for spools with a 1.25" ID. Fits up to a 5/16" center rod. Beveled inside edges to make it easier to fit the rod through while half asleep.
NOTE: This is not a 'friction fit' hub, it's meant to be held in place with a dab of superglue. If you want friction fit, scale it up by a few percent.