Temperature Problem on Prusa i3 Variant

[LuckyImperial]

Has the printer ever worked correctly before?

I would imagine this is wrong PID settings in firmware. Are you using Marlin? Consider recompiling your firmware with Arduino 1.0.5 (a Marlin requirement) and uploading to a freshly cleared EEPROM. Double check the PID settings in the configuration.h file before you do though.

Also, Marlin is not the only firmware available to you. Repetier Firmware is popular and allows compiling with all Arduino IDE versions. Also, the PID setup is just a few clicks of max's and min's.

http://www.repetier.com/firmware/v092/


Oh and +1 Zach w/ an H. All hail the H's.