A remake of thing 2425869.
Developed in openSCAD, allowing the number of temperature steps as well as the start and end temperature to be adjustable.
The temperature of each section is engraved on the back.
Default base height is 2 mm high, and each temperature section is 10 mm high.
That is, in the slicer, the first temperature change should be made at 12 mm, next at 22 mm, etc.
It's possible to change the base height in the customizer. If you do, remember to take note of the different height at which to change the temperature.