PETG settings I trust for parts that live outside

PETG gets a reputation as the filament that strings. It also survives a summer on a north-facing balcony, which is why most of the parts I sell are printed in it. Here is the profile that has worked across three machines.

The settings

Setting	Value	Why
Nozzle	245 °C	Hot enough to bond, cool enough to avoid blobbing
Bed	80 °C	Sticks to textured PEI without glue
Part fan	30%	More fan means weaker layer bonds
Retraction	1.2 mm at 30 mm/s	Tuned for a direct-drive extruder

The snippet

[filament: OZT PETG]
nozzle_temperature = 245
bed_temperature = 80
fan_min_speed = 30
fan_max_speed = 45
retraction_length = 1.2
retraction_speed = 30

What changes outdoors

UV is the real enemy, not rain. Dark colours hold up noticeably better than pale ones, and a clear coat buys another season or two. Threaded parts should get a slightly looser tolerance because PETG creeps under load when it is warm.

Print a test coupon, leave it outside for a month, then decide.

Related: first week with the H2D, where most of this got dialled in.