MMU3 chimney base for PC4-M5

Upgrade your MMU2(s) or MMU3 to use the new chimney released with the MMU3. It gives you a more flexible way to adjust your probe to detect filament in the chimney.

I have added threads for the chimney base so that it can be used without requiring the brass fitting. This is a quick replacement for the chimney base that prints in around 35 minutes. It is the same chimney based that fits this: https://www.printables.com/model/531604-mmu3-printable-parts/files

This is the same model as the Prusa original. Instead of requiring a brass fitting, the chimney base is threaded so you can use the PC4-M5 from your existing setup without requiring the brass fitting.