Cat tree column support

I have a cat tree that the plastic portion that holds a column upright broke. The original plastic was thin and failed from an 8lb cat's use. The column slides over the support, and the support is held to the platform by a captured nut. The column inside diameter is 60mm, the support will fit, but for me it was very snug so I ended up sanding the outside of the support to allow a little more room.

This was one of my first adventures with OpenSCAD so I probably went a bit overboard on the thic