This enclosure fits a Parallax xBee USB Adapter board and a xBee module. It is specifically designed for xBee modules with SMA connectors, however it will work with others as well. The associated lid slides in and is captured by the washer and nut on the SMA connector. This design has been printed on an Airwolf HDx printer and works well. To attach the board with screws, the holes will need to be drilled (#43) and tapped (4-40 tap).
This doesn't come with a lid. Here's the lid:
https://www.shapeways.com/product/X4ML3AKXM/lid-for-xbee-enclosure-case