The Arduino INO file is linked in the thingiverse project files. It looks like most text descriptions edit the text based on the use of slashes and hashtags so copying and pasting the text makes it look very different from intended.

https://www.thingiverse.com/thing:675...

This code does need to be calibrated for your battery by adjusting the voltage range, input voltage, and resistance of the voltage sensor resistors. It is possible the text position might need to be modified to clearly read the numbers.