Quote Originally Posted by flatty_420 View Post
...Pronterface will run the extruder motor with a cold hotend
But just to clarify, the printer prevents cold extrusion, not Pronterface or other host software. Either the printer firmware has things set to allow cold extrusion, or the printer is receiving an M302 gcode command to enable it. IMO, allowing cold extrusion by default isn't a good idea.