My helical coupling 5/16"x5mm
thingiverse
Created with Customizer! Instructions Using the following settings: hole diameter at top is 7.94, hole diameter at bottom is 5, helical length is 10 units, $fn value is set to 100 for precise measurements, screw diameter is precisely calculated to 3, coupling outer diameter reaches 20 and the top length comes out as exactly 25 while the bottom length gets measured accurately at 23.5 units.
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