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Yes, how could I ever make a hook without three failed print attempts thrown in the trash first which will last millennia. If only there was some endlessly-recyclable material like steel or biodegradable material like wood which could be used.

But there is! You can easily buy degradable filaments, made of corn, wood powder and other materials.

I did that haha, picked up a 3d printer so i could increase my manufacturing abilities.

It's been really good for printing brackets and things and simple replacement parts

I'm almost certain that delivery of filament requires some kind of supply chain.

Also, last year, I wasn't able to get filament for about 3 months due to the pandemic.

I don't think the parent's point was that filament didn't have a supply chain, more that filament's supply chain was mostly undisturbed during the pandemic.

At no point was it hard to buy a 1KG spool of PLA as far as I know.