3018 CNC 8mm Lead Screw Handle Knob
prusaprinters
2 Options, just use a standard 3mm screw or use an M3x4x4.2 (M3x3x4.2 for 5mm) nut set. Just use a screw to force the nut set inside. And use with a 3mmx6 grub screw. The Solidworks files are somewhat parametric if you choose to resign.
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