When is a hot glue stick not ... worth possibly wrecking a cheap glue gun. According to the RepRap Wiki entry for PLA, it softens around 60 °C to 65 °C and melts around 180 °C to 220 °C.

However, despite it being quite some time since I was last in such a lesson, hot melt adhesive ... to use, a glue gun can often be simultaneously found in the toolbox of a professional builder ...

Heat shrink tubing might be your friend here, but for an electrically isolated and mechanically supported repair, you may want to give over-molding with a hot glue gun a try. The inspiration for ...