Coil assembly having permeable hub

This invention describes a unique way to package and dispense a long string-like material, such as a 3D printer filament. The material is wound into a figure-8 shape, allowing it to unwind smoothly from the inside out through a payout hole without tangling. A special permeable hub at the center further helps prevent knots, and the design is specifically for additive manufacturing systems using flat "ribbon filaments."

Why it matters: Filed before additive manufacturing became widespread, the need for reliable, tangle-free filament feeding systems has grown significantly with the technology's mainstream adoption. The specific mention of ribbon filaments in 2012 was forward-looking, but such specialized material forms are now more relevant for advanced 3D printing applications.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: ModerateCustom hub, specific winding mechanism.

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