If you're like us and buy Toilet Paper in bulk quantities, you have probably experienced smashed toilet paper that doesn't roll well in your holder or spool. This simple tool straightens the squashed toilet paper center tube. Can be used to straighten and then be removed or since it's hollow, it can be left in place as pictured and remain in use until you swap rolls.

This is sized at 41.2mm for Cottonelle rolls.  Easy to scale in Slicer to suit your needs for the brand of TP you use. 

Easy print, no fancy settings or filament required. I printed ours in white so that it blends in.