So basically I have observed that the gear nozzle seems to stop flowing plastic at mid print. This causes the gear to turn an unmovable filament which then wears out the gear in the extruder and, will require you to send back your robox for an extruder change, adding to your frustration.
Solution is to set the print temperature higher. How much higher may depends on your climate but at where i am(24 degrees room temp in air conditioner) 185 degrees will jam the nozzle midprint(after 2 hours) for PLA. I found it better when nozzle temperature is increased by 7 degrees or in my case to 192 degrees.
I guess the theory behind it is even with the heated bed, after printing a certain amount of layer, the top most part of the object will just be at ambient temperature making the print bed useless.
So end of the day the nozzle temperature needs to be set at a temperature that assumes the print bed is not in play. In PLA i think its 190 to 200 degrees.
I hope cel can solve this issue that causes the nozzle to jam by increasing the temperature as layers get thicker to compensate for the loss of heat from the heated bed to the part.
