The thing is, FFF will add a major modification to the state of the material. Layers construction will affect a lot the ability to withstand humidity, water / air sealing, structural resilience, etc. Material Data Sheet is not a big help here, and I can't find proper studies / experiences / feedback of people using FFF for End-Part able to will 5+ years in harsh environment (no under direct rain or sunlight, though, for most). Except some guys who used FFF basic material for garden decoration, which is a good start actually, while not very promising.
I keep thinking that most components could really be printed with some well chosen filament, be they classic one (PETG, ASA, etc.) but I can't find use-case / paper about them being exposed for year in outdoor conditions.
BTW, if SLA / SLS with proper cheap-ish (not metal haha) unlock this ability, that's interesting too, and I have a bit more insight since there is way more professional use about them than FFF. Thing is, it needs to be cheaper than conventional manufacturing for small (50-100) batches.
What plastic would you use with injection molding? Perhaps that material is available for 3d printing as well.
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