So far I have built the cloud chamber and have moved on to testing. It came as no surprise that it didn’t work first time and the problem is obvious, cooling. The heat sink I am using is not up to the job of cooling the Peltier coolers, again no surprise as it is about 6 years old.
I attempted to solve this with more fans.
The heat sink still reaches about 40 degrees which is about 10 degrees to much, the next step will be to clean the 6 years worth of dust from it and if that fails a new(er) heat sink may be in order.