Makerbot error 57

Makerbot Printer 5th generation has a major design problem in that the cooling fan cools off the extruder way too much in first few passes on a large part. When the temperature goes below about 190 degrees it triggers an Error 57 (Heater Temperature Sag Triggered) This could be eventually fixed by programming the fan to not be on when the temperature goes below a defined temperature threshold. As of today not a part of the most updated firmware. The work around I discovered today was that if you take the font bolt on the fan off and barely loosen the second bolt you can tune the temperature of the extruder. On big parts pull the fan away from its cooling position (forward towards you). Once your part starts printing turn the big dial slowly until the extruder temperature shows. Keep moving the fan away from the extruder until the temperature goes above 200 degrees preferably near 215. On my machine the temperature sag error happens around 190 degrees. The higher temperature near 215 will probably avoid filament errors as it will all stay nice and liquid near the nozzle. The filament acts like a coolant to the extruder and the fan's air trapped in a small area during the first 1/8 inch does excessive cooling. Combined they bring down the extruder temperature too far. A good design would turn the fan off at about 210 degrees. The fan seems to run constantly when the the printer is extruding. There needs to be a temperature feedback loop! In my classroom large parts have this problem weather the extruder is new or old.