I actually see it as weirdly counterproductive. When bioplastics degrade they release their carbon into the air as carbon dioxide. Whereas a properly landfilled piece of plastic takes its carbon permanently out of circulation, it's literally sequestered.

Landfills get a bad rap. When they're done right they're a clean and reliable way to deal with waste. They're just easy to get wrong if you don't care, and they look so unphotogenic it's easy to campaign against them. But one of my favourite parks is a former landfill done right, aside from the occasional monitoring well scattered around the place there's no way to tell what it used to be.

Are there any good alternatives though?

Or maybe qualify that as "minimal plastics".

It is crucially relevant how long decay takes. That's why there's microplastics in your food and your body. Because plastic does not degrade for hundreds of years. Fucking Obviously, that is the single most important aspect of it.

That's incorrect, making things from crops that use farms which could be wildlife habitat and use oil based fertilizers and pesticides isn't necessarily better or emit less net co2. It may in some cases be better but just like corn based ethanol it can also increase food shortages and depending on where it's grown be worse than just using oil.

It's a Prusa MK4, so I'll get it upgraded to the Core One to get it enclosed, and construct a vent.

Based on what I'm reading, the glass transition isn't the issue, it's the plastic itself. PLA is brittle, and taking supports off creates an incredible mess. I also use ASA, and while it seems to be less brittle, there's still quite a mess. (Thankfully, ASA doesn't breakdown to release the styrene until it hits 400C, and the extrusion temp is 260C. That means the accumulation of the microplastic doesn't include the carcinogenic aspect, just the ones listed and suspected of micro plastics in general).

I used to use an SLA printer since I like making minis, but the resin started irritating the shit out of me, was insanely difficult to clean, and apparently the UV reactant is carcinogenic. I stopped using that entirely 4+ years ago (maybe used it for 6 months irregularly). I want another, but not without a much better workspace and proper ventilation. Except it, as well, results in a resin copolymer that I would find extremely likely to cause the same micro plastic hazard.