I made a simple spiral spool for respooling using cut connectors and happened to share a photo of it online. Several people asked if I'd share it, but also requested a twist-lock model so they can use it with refills. This is that twist-lock model. I've uploaded the respool-only cut connector version separately at https://makerworld.com/en/models/134650#profileId-146120 . If you use refills, this should work nicely for you. I've included a version with a notch for Bambu refills and a version without. Hope you have a great day!