Temperature Test Tower

Print with 1 perimeter and 0 infill, 0 top and bottom. You might want to use a brim to hold it to the bed.

Either manually edit gcode, or use the layer change plugin in Cura to change the temperature every 10mm. Compare each 10mm section to find the best temperature.

See Tom's video for more details: https://www.youtube.com/watch?v=FSOPsRiiOZk