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I have a thread in an actual product, that I want to replicate in a 3d print.

I have no clue on what to measure, and how to replicate it.

This is the thread: enter image description here

One possible solution is this: I have an openscad script called metric_iso_screw.scad that it creates threads. However, it has many functions and I don't know which one is suitable for this kind of thread.

EDIT: Picture used for reference:

enter image description here

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Measure four things:

  1. the pitch ie distance moved in one turn, or one thread to the next

  2. outer thread diamter

  3. inner thread diameter

  4. angle of thread or between the faces: often 60 degrees

But consider just cutting the thread after the part is produced, likely stronger.

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  • $\begingroup$ as the reference is to the metric version of creating threads, the appropriate (easier) reference on 1. is to use the thread spacing. I wonder about cutting threads in plastic being stronger. I've not seen any structured testing on YouTube regarding such an approach. It could be a useful focus. $\endgroup$
    – fred_dot_u
    Commented Aug 4, 2023 at 14:43
  • $\begingroup$ @fred_dot_u the software mentioned metric but the picture does not provide any info about the thread - even looks like the profile is flattened. So metric may be an assumption? $\endgroup$
    – Solar Mike
    Commented Aug 4, 2023 at 15:36
  • $\begingroup$ I agree that it's an assumption. If the desired thread is SAE/Imperial and the code being used is metric, there is trouble afoot. $\endgroup$
    – fred_dot_u
    Commented Aug 4, 2023 at 17:18
  • $\begingroup$ I edited my question with a picture. 1. Is what you refer as outer diameter, what is called as major diameter in the picture and what you refer as inner diameter as what is called minor diameter in the picture? 2. How exactly do I measure the angle of thread? 3. What do you mean by consider cutting the thread after the part is produced, likely stronger? Thank a lot! $\endgroup$
    – user1584421
    Commented Aug 4, 2023 at 18:55
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    $\begingroup$ Metric is the measurement system based on the meter and gram as basic units of measure and prefixes such as milli-, kilo-, mega-, etc., as multipliers. It has nothing to do with whether or not the thread is flattened. The alternative to metric is the Imperial system using inches and pounds. $\endgroup$
    – Transistor
    Commented Aug 4, 2023 at 20:38
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If you have any bolts of known thread then offer them up side by side and engage the threads to check for a match. Then you've got the pitch at least. If it's metric then you're probably looking at M10, M12, etc. and you can determine that from the outer diameter.

See https://engineeringtoolbox.com/metric-threads-d_777.html.

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