Have a picnic table but no picnic umbrella? I had a golf umbrella but it fell through the hole in the table so made this.
Made in PLA with supports in the middle of the cylinder. I scraped out the support material but left a bit in to grip the umbrella handle better.
Added a fuzzy skin in Prusa Slicer to the outside of the adapter to make it even more grippy.
Designed in Sketchup and Freecad.
The author hasn't provided the model origin yet.