All3DP’s October project roundup includes the Fast Strong Automatic Respooler V3, a printable mechanism designed to transfer filament cleanly from one spool to another. The creator recommends at least 10% gyroid infill and says the latest version reduces the tendency for spools to jump while winding.
The same roundup points to a cardboard-spool adapter with a STEP file, useful because STEP geometry is easier to adjust in CAD than a raw STL mesh. This is a particularly sensible approach when a spool does not fit an AMS or feeder smoothly.
What to do: browse the roundup, compare the respooler’s assembly complexity with the problem you actually have, and download a STEP-based adapter if the issue is just a spool rim. Avoid treating respooling as a fix for a blocked PTFE tube or extruder.