Three-Piece Bambu Spool - A More Compact, Detachable Spool Solution for Bambu Lab Spools

An injection-molded design intent model has been added, allowing filament to be directly inserted into the central shaft's fixing hole for winding, or a mortise can be added to the fixing hole for mounting Bambu spool-less filament. As the shaft in this version is excessively smooth, a removal handle has also been designed for disassembling the disc at the fixed end.

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This is a more easily stored, detachable Bambu spool solution—a three-piece spool design, comprising a custom central shaft and two identical discs. Complete disassembly achieves at least a 50% space saving compared to the two-piece spool design, and utilizes filament boxes for organized storage:

• Utilizing an asymmetrical central shaft design, different clamping forces are applied to the discs on either side of the shaft. The filament spool side features a locating slot, while the other end is active. This design ensures that the spool can be unscrewed from the active end during filament changes.
• The left and right discs are identical, with a disc thickness of 8mm. A standard filament box (70mm thick) can accommodate 8 discs. The configuration file provides two disc options: a replica of the original factory-holed Bambu version and a simplified version; choose as needed.
• The central shaft has a diameter of 81.7mm. A standard filament box (70mm thick) can accommodate 5 central shaft assemblies.

Assembly Tip: Due to the asymmetrical clasp design of the central shaft, please apply increased force when assembling or disassembling at the spool slot end!

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This design represents my considered response to the ongoing challenges of detachable spools. During my use of spool-less filament, the imbalance between the number of spools and the number of opened filaments has consistently been a difficult problem, with a constant cycle of "not enough spools" and "piles of spools." Due to the size of the two-piece spool, trading spools between users or spool recycling by some filament manufacturers faces excessively high logistics costs. The new three-piece spool design saves at least 50% in storage and transportation volume, reducing logistics costs to a level where manufacturers can practically recycle them (within mainland China, 4 sets of spools can be sent in 2 filament boxes within the first-weight range of express delivery). This new design aims to bring some fresh ideas to users and filament manufacturers alike.