Customizable Temperature Calibration Tower

I took the source project by kerog777 and modified the python file to work with the new Cura version (3.0 and up I believe). I figured I'd just release my own set of instructions for this as well.

This comes with an STL file to test temperature from 240 down to 195, but if you want to modify that range, you can edit the included OpenSCAD file and adjust the "BottomTemperature", "TowerHeight", "HeightIncrement", and "TemperatureIncrement" variables, and then render them down to another STL fil