This hub is intended to be used with filament coils with 76mm inner diameter and 58mm coil width.
It works with Solutech "Masterspool" refills. These refills actually have a 2.5mm thick cardboard ring as a core. This core seems to be clearly intended to remain with the coil while in use, so I based the ID measurement on it.
It is interchangeable with all other s-type parts you'll find at https://thingiverse.com/thing:2823667
2 Wall Lines
3 Bottom Layers
4 Top Layers
optimized for 0.4 Nozzle
I have printed it in PLA - it works just fine
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