Case for the NanoVNA test fixture PCB.

This is a case for the little test board.  There are two versions of the top.  I configured my board with the top left connector shorted, the top right connector has a 50 ohm resistor, and the bottom two connectors are bridged.  I use these for calibration of the VNA before making measurements.  If your board is configured differently, there is a blank version of the case top without labels. 
The case is designed for M3 x 8mm screws, however the PCB holes will have to be just slightly drilled out to allow the screws to go through.
Modeled in FreeCAD