I wanted to change the generic PLA material print temperatures using 4 years old Hicktop printer which uses USB to connect to the computer. Unimaker Cura 5.8.1 is the software interface. If you use a memory stick to transfer the g-code to the printer, no problem. Modify the g-code to the desired temperature settings. However, when printing via Cura sets the temperatures and they are not modifiable using Curs. You can modify them however, with a text editor. (I use Notepad++ as Administrator in Windows 10) With Cura CLOSED, on my computer the following file provides access to the material settings. Illustrated is for generic PLA. It’s an 8K FDM_MATERIAL file.
C:\Program Files\Unimaker Cura5.8.1\Share\Cura\resources\materials\generic_PLA_175.xml_material
Look for : <setting key=“Print Temperature” = >200</setting // where 200 it the nozzle temperature you want to change to a different value
<setting key="Heated Bed Temperature" = >60</setting // where 60 it the bed temperature you want to change to a different value
I changed my nozzle temp to 210 and the bed to 70 as an experiment. I suggest keeping the temperatures within the published material printing temperatures.
What started this was I needed to improve the quality of an ABS print and the default temperatures were a bit low. Hopefully this post will prove helpful to users of Cura who want to change their nozzle and bed temperature settings.