Metric Nut Sizer
thingiverse
To size holes for captive metric nuts (M3 to M6), print the calibration board. Utilize a cylinder in OpenSCAD with $fn set at 6 for nut hole creation. Note that metric nuts have a diameter range, so adjust the scad file as needed. The .1mm increment is usually sufficient; however, slicing software may cause slight discrepancies. The calibration board features varying radii for M3 to M6 nuts in rows and columns.
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