A handy box for connecting D-Sub9 connector cables together in paralell. I use this for lab and service work for CAN and RS485 cables. The number of connectors can be changed by editing the parameter 'connN' in the scad-file. Stl files for 3, 4 and 6 connectors are available in addition to the scad file, see https://www.thingiverse.com/thing:7258532
You are correct, I changed to D-Sub