For safety reasons the minimum extrusion temperature for printing is set at 150 degC. In certain situation this value is too high. To change this value please take the following steps.

1. Go to the download section www.felixprinters.com/downloads and navigate to the firmware of your printer. Then go to the sources subfolder and read the manual how to upload custom firmware.
2. Open the firmware files with arduine ide software and go to the tab configuration.h
3. Search for the line.

   #define MIN_EXTRUDER_TEMP 150, change it to your desired value.

4. Upload the firmware
5. Check if it worked.