You can quickly generate ISO standard threads using this ready-made OpenSCAD script (right-click and save-as to computer): https://dkprojects.net/openscad-threads/threads.scad
Make sure to download and setup OpenSCAD first: https://www.openscad.org/downloads.html Try getting the ZIP package which is portable and does not require a full Windows install.
1. Modify the parameter values to your needs and then render the thread inside OpenSCAD. You can simply remove the comment token '//' in one of the examples to allow the compiler to execute it.
The 'metric_thread' module is already defined in the script and the examples cover the various arguments it accepts.
Reference- ISO metric thread chart with nominal diameter and pitch measurments:
https://en.wikipedia.org/wiki/ISO_metric_screw_thread
2. Export the render as an STL.
3. You can then import this STL into DSM and use the object as a cutter for geometry you've already created.
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