Bearing spool holder with adjustable brake
thingiverse
Spool holder with adjustable brake for 51mm spools helps prevent uncontrolled spool unwinding. To create this device, you'll also need two bearings (6905 type) measuring 25x42x9mm. A compression spring with a wire thickness similar to standard extruder springs but thinner is required; my spring has a 0.5mm wire, found in my workshop among other useful items. A felt slice (1-2mm thick) is glued at the brake's end. After assembly, adjust the brake for moderate friction that prevents free rotation without excessive resistance.
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