But heat dropping fast is almost all pure physics. You would examine the heating element and how well it's attached to the extruder.
My 3d printer (Monoprice Maker Select Mini v2) is experiencing a problem: When I heat the extruder to the desired temp, then try to print something the extruder’s temperature will rapidly drop below the desired temperature. (I cannot use Monoprice’s tech support function, because I ordered my printer from amazon.) Some help would be great, Please and thank you to anyone who is willing.