This is a copy of Akiland's Heat Tower with a bridge (remixed from MBTech's heat tower), that I have grown to rely on.
I wanted to modify the numbers to handle higher temperature filaments, so I recreated it in Tinkercad. I've included two .stl files here, but if you wish to customize your own numbers you can access the Tinkercad file yourself using the link below.
I won't go into detail on setting this up for print, but if you print this at 100% scale and .2mm layers, you should adjust your temperature drop every 25 layers with the first drop occurring at layer 26.
The tinkercad is public, so you can copy and adjust your own numbers as you see fit.
Tinkercad Link: https://www.tinkercad.com/things/3bRMLTbTA4h