This spreadsheet uses 3 different methods to calculate thermistor tables for input into Marlin (sorry, I'm not sure what the thermistor data input is like in other firmware). Useful if you've had to buy a new thermistor and you aren't sure if the default tables are right for you, or even if you just want to fine tune your thermistor to get better control of temperatures.You can use the following inputs: Method 1 - R/T data tables from the thermistor manufacturer Method 2 - Beta value for the thermistor Method 3 - Manually measured Resistance / Temperature data Read the instructions within the spreadsheet, to see how it works. For a lot of us, calculating our own thermistor tables isn't really necessary, but I had an experience recently where I wasn't sure about my replacement thermistor, so I had to figure out how to use the OEM's R/T tables to configure marlin. I thought I'd share my work.