Hat Stretcher

Hat stretcher for baseball hats. Works best on flex fit hats. Its broken into 4 pieces so it would fit on the bed of my printer.

It is meant to be used with:
- 1/4 x 6 carriage bolt
- 1/4 nut

To make the knob: I printed the `knob.stl` file and paused the print once the nut would fit inside the print, placed the nut in the knob and then resumed the print so that the nut was totally embedded into the knob.

The carriage bolt gets sandwiched between the two bottom pieces when they are slotted together. Everything is press fit and fits very solidly for me. I had to tap the pieces together with a rubber mallet to get everything to fit together.