T-Slot Filament Spool holder M8 and American Standard Size

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This versatile spool holder accommodates larger spools while also supporting smaller ones. Due to unavailability of M8 threaded rods locally, this design caters to both American-size threads and metrics. The required hardware consists of a 3/8 threaded rod, eight 9/16 nuts, six 3/8 washers, four spool caps, a spool holder body, a feed tube spinner, and a feeder. For M8 setup, simply replace all hardware with corresponding M8 components. The "Jam Nuts" prevent inner cap movement, while the "Adjusting Nuts" tighten spools for free rotation. Proper adjustment ensures spools don't over-tighten, and no nut is needed on the spool holder body in a dual spool setup, allowing easy servicing of either spool by removing the respective cap as per Fig. 1 instruction.