MMU3 Modified Chimney (spring & PC4-M5 threads)

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. 

I also updated the chimney (along with the base) so a spring can fit over the 39mm M4 screw between the chimney and the base allowing for easier adjustments. 

As noted, this chimney set will work for MMU2/3 units.

It is the same chimney & base that fits this: https://www.printables.com/model/531604-mmu3-printable-parts/files

I took the original parts and modified them so I could use a spring (instead of the washer) to adjust the IR chimney. I also added threads to the base so the PC4-M5 pneumatic fitting can be attached without requiring the brass fitting for the part.