Im making USB powered lamps on the cheap, and the cost of USB connectors can be bypassed with this and a few paperclips for the terminals. Use a pair of needle nosed pliers and a lighter to heat and manipulate the paperclips into place inside the PLA. Crimp the backs of your paperclips into your wire/optionally add solder.

Scale down slightly or file if its a tight fit.

Do not attempt electrical work without proper working knowledge of electronics. I offer these instructions up for theoretical understanding only and take no responsibility for any damages you may accidentally cause to your devices or to anything else.