Modular (Endless) Spool Holder

pinshape

The concept revolves around a premise that each spool holder operates independently AND can be easily linked together in a stable configuration. The "leg" (parallel_spool_holder-side.stl) is designed to interlock with the "axle" (parallel_spool_holder-top_XX.stl), allowing it to function as a spacer, maintaining consistent width based on the spool's dimensions -- and yet still be simple to replace. Round rails (parallel_spool_holder-rail.stl) connect the entire structure, providing stability because they form a flat rectangular base with the "legs". A rail is engineered with 150 mm length and can be connected to a subsequent rail using a pin bolt (parallel_spool_holder-pin-distancer_v3.stl), creating an endless arrangement. As current length may become a limiting factor in confined spaces (boxes/containers), the rail can easily be shortened (by slicing it with negative Z) to accommodate the whole structure within those restrictions. Three different lengths of "axles" are available, corresponding to inner (or spool) widths of 66, 72, and 80 mm, designed to accommodate standard 750 g and 1 kg spools. The behavior of a spool on the holder is even better than expected. The spool rolls smoothly without any jerking, eliminating the counter pull of filament that occurs during spool jerking roll. See it in action: Printing a holder for one spool requires (for 2 sides, 2 rails and 1 top) around 40-45 m, depending on type and infill, of course. All parts shown are made of PETG, but I'm confident that PLA would prove to be an adequate material (with proper slicing settings).