A collection of cup holders that slide between your couch cushions. Free to download https://makerworld.com/en/models/1318086-cup-holders-for-sofa-cushions#profileId-1353638
A collection of cup holders that slide between your couch cushions. Free to download https://makerworld.com/en/models/1318086-cup-holders-for-sofa-cushions#profileId-1353638
It’s upside down, looks like he/she designed one to go in the side between the cushion and the chair arm. Actually a pretty smart idea.