plot thermometer / clock for 3D printers

Update #5: Description of the calibration process -> Instructions
Update #4: Minor bug fix in the Calibration routine -> v1_1b
Update #3: Improved servo arm attachment. See Instructions
Update #2: Additional version of the servo arms. See Instructions
Update #1: Videos of the plot thermometer/clock: http://youtu.be/0nTKUaYZzgA and http://youtu.be/XSc-_maon80 (please see further update info under instructions)
This plot thermometer and plot clock is based on http://www.thingiverse.com/thing:248009 and http://www.thingiverse.com/thing:255608
Initially only with the intention to replace the screws with printed hinges I made several improvements:
Hardware:

• Printed hinges
• Fully cover of the electronics
• Covered servos
• Thermal measurement
• Integrated switch and power jack
• Hooks for wall mounting
• I2C connector for further enhancements like motion sensor etc.
• mechanical stability
• FDTI programming port for the arduino
• Magnetic drawing board holder
  Software:
• Inline calibration & setup (use x when connected to a 9600 serial terminal)
• EEPROM storage of the calibration values
• temperature measurement capability based on a DS18B20
• possibility to choose between time and temperature display
• Display flip capability (for wall mount)
• switch for multiple functions (temperature or time / plot on or off)