... before it should be changed?

Depends on whether or not the PLA contains carbon fiber or "glow in the dark" additives.

These are very abrasive, and damage the tiny hole the plastic is squeezed through (in less than roll 1KG roll printing quality will suffer).

Apart from that, the PLA generally doesn't damage brass nozzles, although they can get clogged.

Edited 1 time(s). Last edit at 01/30/2021 07:06PM by DragonFire.

Thanks for the info. Im just using regular PLA.

It will also depend on how well the nozzle was designed an what grade of Brass they used.

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Computer Programmer / Electronics Technician