STL_THREADS(1)

💖 STL_THREADS 💖

okay bestie, this is a User Command — it lives in section 1 of the manual, and its whole name is stl_threads. yes it's a little niche. no I will not be normal about it. 🧵✨

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✨ NAME ✨

stl_threads — outputs an STL file with male or female threads per the ISO metric screw thread standard. that's the whole job. it does one thing and it slays at it 💅

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🌸 DESCRIPTION 🌸

stl_threads outputs an STL file with male or female threads per the ISO metric screw thread standard.

like, literally that's it, that's the vibe. you give it an output file, it hands you back a screw thread. gender of the thread is your call. iconic behavior honestly.

here's how you actually call it:

usage: stl_threads [ -f ] [ -D <diameter> ] [ -P <pitch> ] [ -a <angle>
]

       [ -h <height> ] [ -s <segments> ] <output file>

Outputs an stl file with male or female screw threads per the ISO metric screw thread standard (http://en.wikipedia.org/wiki/ISO_metric_screw_thread).

so the full thought is: stl_threads takes an <output file> at the end (that's the one argument that isn't behind a flag, bestie, don't forget it) and writes screw threads into it. male threads by default. the ISO metric screw thread standard is the rulebook it's playing by — link above if you wanna go down a wiki rabbit hole, and honestly you should, it's giving nerd core and I respect it 🔥

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🎀 the flags, one at a time 🎀

• -f — outputs female threads. that's it. defaults to male, so if you don't say anything you're getting boy threads. your choice 💖
• -D <diameter> — changes the major diameter of the threads. bigger number, bigger thread. major diameter is the fancy name, iykyk.
• -P <pitch> — changes the height of a single thread, aka the pitch per the ISO metric standard. one thread's worth of height. that's the pitch. 🦋
• -h <height> — changes the total height of the threads. not one thread — the whole stack of them. don't mix these two up, I'm begging 😭
• -a <angle> — changes the thread angle (degrees). the standard — and therefore the default — is 60 degrees. ok so here's the tea for the 3D printing girlies: this can cause overhang issues, because 60 degrees ends up being a 30 degree angle with the ground plane. if you set it to 90 degrees, you get a 45 degree angle with the ground plane. geometry said "let me fix that for you" 🫶
• -s <segments> — changes the resolution of the generated STL file. more segments yields finer resolution. <segments> is the number of segments to approximate a circle. defaults to 72 — which is every 5 degrees, cute right? ✨
• -o <outer female diameter> — when you're generating female threads, this is the outer diameter. ⚠️ must be greater than <diameter>. like, it's a hard requirement, not a suggestion. if it isn't bigger it's not gonna work out, sorry bestie 💀

side note: everything here is straight from the standard and the program, no guessing on my part. I would never lie to you about a -D. 💜

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and that's the whole page, babes. no hidden options, no secret sauce, just stl_threads being extremely good at exactly one thing. go make some threads, go 3D print them, go be the main character of your own workshop 🌈💅

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this has been stl_threads v1.2, June 2025 — thank you for coming to my ted talk, mwah 🎀