There are several factors that will impact the lifetime of a hot end assembly which can lead to filament leakage. Some of these factors include leaving the machine at temperature for too long, improper print settings, or printing at improper speeds.
Low-temperature (ABS) vs. high-temperature (PEEK): If you are printing at high-temperature most of the time, you can expect your hot end assembly to experience quicker wear.
The expected lifetime of a hot end assembly is 100-200 hours of printing service.
Use Krytox GPL 225 grease. This product has been specifically selected for its chemical compatibility with motion components and high temperature resistance. The use of alternate products may damage your printer components and will void your warranty.
You can find instructions for lubricating the axes in our Maintenance articles.