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I started ordering polymaker coming from overture. Both brands had swapped to cardboard spools. But as mentioned polymaker has a file uploaded to printables to print a ring border so they can roll easier. Especially since the cardboard rolls can get dented if shipped haphazardly.
https://www.printables.com/model/495778-polymaker-cardboard-spool-adapter
But I've gotten lucky, and the spools I have received with cardboard haven't been damaged. But I have considered printing a few of these just in case...
There’s a version for overture that works basically exactly the same. Highly recommend.
2 of 2 polymaker 1 kg spools I've purchased (from Amazon) arrived with dents along their outer lip. I bent them back and, although the result wasn't perfect, didn't have any problems. It does have rethinking my spool holder design so they rotate around their inner lip though.
Polymaker also makes PolyTerra filament. Cheaper, stronger, and environmentally friendly.