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A replacement for that piece of plastic found in outdoor dining tables that fits in the hole where the umbrella goes through the tabletop (to me it looks like a grommet, but perhaps there's a more specific name?).
My parents asked me to design & print this to replace the original part that broke somewhere along the line and for which no replacement was made available by the manufacturer.
The replacement part was printed in PLA on a Prusa Mendel Reprap and has survived several seasons of Wisconsin weather.