I found that the driver boards for the motor (ULN2003) have male pins, and the only female connectors I had would have made the connecting wires way too long, so I figured I could just print some female/female connectors, connect those and shove in the male pins iyswim.
While knocking it up, I figured the same approach would work for the male GPIO pins on a Raspberry Pi, so I elected to go for a parametrisable approach - current state of play here:
http://www.thingiverse.com/thing:1321221
It occurs to me that this could have some other uses for prototyping electronic stuff as shunting two wires into the holes gives a reasonably strong connection, and adding optional flanges could also allow these parts to be connected quite easily to more complex models.
Seemed like fun anyway

Also, wanted to give a shout out for openjscad
