These are just a simple single-piece holder for JST socket connectors used as cable ends that allows easier connection/disconnection and weather resistance (if filled with glue/epoxy/etc.).

As designed, they require the connector be glued in for use (test your connectors first); for my purposes, what worked was cyanoacrylate to bond the connector to the holder, and hot glue into the wiring hole to make them weather resistant and add strain relief.

You will want to print these with the wire-hole end down to avoid overhangs. 

Dimensions for the plugs allow about 0.5mm shrinkage, which has worked well for the connectors I have. OpenSCAD source is included if you need to adjust.