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Have you tested any of your prints to see if they're water tight? That's not an easy feat, but figuring it out also won't require an enclosure. I once tried printing a pool part out of PETG and it filled with water very quickly - you could see it whicking through the layer lines. Once you nail water tight printing via tuning, a TPU gasket should give you a pretty decent seal.
Are you looking to go multi-matetial? I've run quite a range of material through my stock i3 extruder and also my Rapido HF on my stealthburner. Both extruders have handled a decent range of materials without a ton of fuss.
I went for ASA over ABS because it has a reputation for being lower odor and easier to print. If you've figured out PETG, ASA won't be too hard. Natural colored ASA was super easy to print. Colored ASA needed a lower extrusion multiplier and was more prone to warping in my experience. Don't rush either (do a test print, clean and level your bed, use an enclosure) and it shouldn't be that hard. Assuming I had a clean and level bed prints were pretty uneventful. I went for 100 bed / 245 extruder. The only small gotcha was needing to PID tune at the higher temperature.
Not yet, I’ve only ever printed PLA and heard that it will never get water tight. Grant it, I have a print I can test when it finishes up in a day or two.
I thought about running multi-material but would need to get that add on that can splice in filaments to run through the Neo’s single extruder ( maybe the sidewinder x1?), but can’t remember what it’s called to look at reviews
I wouldn't worry about multiple extruders in that case. Most of the current high performers are well rounded enough to be able to handle most anything you throw at them.
Thank you!