humbug.
AI has ruined yet another dream... for now. Although, silver lining here is that I looked it up before having a literal meltdown and pumping a bunch of dissolved plastic into my tank.
I was printing some seals out of TPU for my kalk stirrer and was curious how it would hold up in the highly basic environment, so i asked AI. It said it would get hard and brittle over time, sucky, but i could replace seals. Just print a bunch and move on with life right? But no, it doesn't end there. I had to ask about PETG. Apparently there is such a thing as "alkaline hydrolysis" which would melt all my PETG parts :/
"""
The "PET" in PETG stands for Polyethylene Terephthalate. Like almost all polyesters, it is highly susceptible to
alkaline hydrolysis.
When PETG sits in a solution with a pH of 12+, the hydroxide ions ($OH^-$) don't just sit on the surface; they actively attack and "unzip" the polymer chains. This process is essentially chemical recycling—the lime water is trying to turn your printed part back into its liquid raw materials.
What will happen to the part?
- Surface "Chalking": Within a few days, the surface will turn dull and white.
- Loss of Strength: The part will become extremely brittle. A part that used to be tough will eventually snap like a dry cracker.
- Disintegration: In concentrated, warm lime water, thin-walled PETG parts can completely lose structural integrity and crumble into a "sludge" or fine powder over time
"""
So, now I am wondering. Do i get a bunch of polypropylene and try and re-print everything? Or take my lumps and buy an Avast kalk reactor? I dunno. Maybe I will sleep on it.