This is a protective case for the cheap Chinese CW decoders you can buy on Amazon or elsewhere. 

This is my remix of Nutter5's remix of cnedell's model.  The original had an embossed callsign.  Nutter5 removed that callsign but didn't label the ports and didn't upload here so I am.  I did add the lettering to the case.  My callsign is not on the uploaded model. I added that in Bambulab. 

There are holes for screws but you don't really need them . The two halves snap together snugly.  I used a .4mm Nozzle with 15% grid infill.  I also set the labels to print first.