1. First things first: you're going to need a copy of RepRap Firmware.
Either download a fresh version from GitHub, or edit your existing one.
You can edit your existing firmware either through the online configuration tool, or through G-Code.
If you download a fresh version of RepRap Firmware you'll have to configure more settings than the ones mentioned in this guide so that it will work well with your printer.
2.1. Manual Editing:
For firmware versions 1.16 and earlier, use the following G-Code command in the config.g file on the SD card:
M305 P1 B4388
For firmware versions 1.17 and later but lower than 3.0, use the following command instead:
M305 P1 B4725 C7.060000e-8
For firmware versions 3.0 and later, use the following command instead:
M308 P1 B4725 C7.060000e-8
2.2. Online Tool:
Click on the Calculate Thermistor Coefficients button in the Heaters tab, and select:
Semitec 104-GT2 (used by E3D)
from the drop-down menu.
Update, For the most recent version of the reap rap firmware you should be using the following parameters for the thermistor.
T parameter: 100 000
B parameter: 4725
C parameter: 7.06e-8
3.1. Manual editing:
Update your maximum temperature by sending the following G-Code command to your printer:
M143 S285
While the V6's metal components can handle very high temperatures, the included thermistor cartridge will struggle with temperatures over 285°C (if you want to go higher, get a PT100).
3.2. Online Editing:
Update your maximum temperature by going to the heaters tab and changing the option to:
285
4. Simply restart your printer for your new values to come into effect.
If you're unsure of how to update your printer's firmware, check with its manufacturer.