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Hi Amarand, One of the things I have done to make sure replacing the nozzles cold, is to make sure the teflon insert is long enough so it gets compressed when you tighten the nozzle.

I purchased 3ft of teflon tube from Amazon and cut my own teflon inserts. It is a little tricky to get the length right, but if you do get the length right the nozzle will compress the teflon tube ever so slightly when you tighten the nozzle. This results in the teflon tube ends being pushed up against the nozzle on the inside and it prevents filament from oozing out into the threads.

I know there are some comments that this doesn't work, but I have been using it for several months now and hey, if the tool does break, I will print a new one :)