Fits around the bottom of the feet - it is a tight fit. I would recommend that you print just the top cup portion first to try and test fitment, since the entire print uses a lot of filament.
Infill is printed at double line width for strength.
https://www.amazon.com/Bugaboo-Stardust-Playard-Portable-Foldable/dp/B08PQ1R3WH
The author hasn't provided the model origin yet.