This is a one piece box insert for the Coup card game. It fits easily in the box and does not fall out when tipped. Overall dimensions are 143 x 102 x 29 mm.
The design was made from scratch using Sketchup but was heavily influenced by borderjs's two piece design. Thanks for the great idea!
The original source file is included if you want to tinker with it.
Support is not needed if printed flat. Infill and resolution are up to you.