Can heat guns damage brass nozzles and UM3 print cores?

[FalmouthLouis 3]

Over the last six months, I've sometimes blocked a nozzle when under pressure and it has made more sense to quickly change the nozzle than to go through the whole Atomic clean process. I also have one BB print core where the PVA has just refused to flow however many hot or cold cleans I do.

 

I now have a heat gun and an assortment of fine needles and probes. My machines are busy enough that I would like to clean these nozzles without being dependent on finding gaps in print schedules.

 

At what temperature do brass nozzles get damaged? Same question for the BB print core, though this also has electronics inside which I assume could be damaged.

 

Any advice out there?

[robinmdh 100]

I'm not exactly sure, however I remember a mechanical engeneer telling me the bit with the cooling ribs should not become much hotter then 90 degc  this is a very safe conservative estimate if I recall but keeping the Teflon insert from degrading is important so if you can monitor that and/or add cooling if needed it would likely help keep your printcore functional.

 

For the rest of the printcore: The metal themselves should not have a problem with a heatgun but the sensor and heater cartridge might and I don't know.