Tinkeriffic BB Bearing 32mm Spool Spindle
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The original Tinkeriffic Spool Spindle (of 2012 vintage) functioned adequately, but was never a baby's-butt-smooth solution to my filament feeding fiascoes. This three-part solution (thirteen parts, if one counts the 4.5mm BB's) is designed to use a Tinkertoy rod as an axle and is a much, much smoother ride for your 32mm filament spools. I found inserting BB's into the original 608 bearing to be frustrating so I split the bearing in two and left it to the end user to super glue the parts together. The walls of the inner spool are by necessity quite thin; I recommend multiple shells or high infill for that part.
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