[zihotki]

any reason to use PETG instead of PLA? PLA is plant based, in theory bio-degradable, while PETG is produced from crude oil.

[brovonov]

That is mostly true, PLA is ONLY biodegradable in a facility that can handle that. Your run of the mill recycling center in your city probably can't or won't take your PLA prints.

[gambiting]

And then only if it's pure PLA with no additives. Which most PLA has to improve speed of printing or strength or some other property. In practice, I'd wager that 90% of commercially available PLA fillament is not actually biodegradable.

[dgroshev]

Less creep, slightly better at absorbing shocks without breaking, better failure behaviour (PLA can suddenly shatter leaving sharp edges, PETG tends to deform elastically first).

[Fomite]

Note that "deform elastically" is not necessarily a desirable failure state if it happens earlier than shattering.