The original axle falls off one side of the dispenser too easily, so I remodeled it and added a flange. Due to the flange, it has to be assembled in order to go through the spool, so I threaded one end and made it two parts.
I successfully printed this in PETG (Amazon Basics) on my Prusa Mk3. The threading is snug, but functions. You may need to scale down the small piece a percent or two on the x/y (don't scale z!) to make it screw in easily, depending on how well your printer is tuned.