The threads in the file you posted looks fine to me:
I'd be quite happy with those if I was printing a thread. A smaller nozzle is always going to better at things like this (with the obvious downside that the whole thing takes ages to print). If you're printing Nylon, make sure it's bone dry, and keep it in a dryer while it's printing if you can. Nylon isn't the easiest to begin with but moisture makes things so much worse. Printing threads in general is still a very tricky business. If you need much better than this your best bet is to go the hardware store and find the right bits and some glue. 🧰
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Slashee_the_Cow 541
If you could share the Cura project file (.3mf, set it up then go to File > Save Project) that would help since it has the model and all your printer and print settings.
Threads are really hard to print properly, especially depending on the overall size of your part. What material you print them in is also pretty important: if you just print PLA the odds are reasonable it'll snap at some point in the "screwing it in" process (PETG is better, but printing threads is still hard regardless).
Some settings you need to look at for best chances of success:
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giostark 1
Yo Slash ,
Thanks for your quick and accurate response !!
This make the best result till now with layer at 0.3.
Unfortunately the first 2 suggestion do not make any difference. And the fourth also do not affect the result but it have to stay inclusive for matching reason.
This third setting have to be at 0.25 at least . Over this value it make the same bad result.
Walls > Minimum Wall Line Width: There is a guideline for line width to nozzle size. It should be 60-150% of your nozzle diameter. If you're using a 0.4mm nozzle that means you should set the minimum width to 0.24mm.
But with layer at 0.1 (and 0.2) the result is still altered. (last pic "not-ok")
i do expect a better slicing at low layer height , instead come better at 0.3. And I should print the part at 0.1 for a better quality of the thread.
I'm using Nylon on a custom delta , 0.6 nozzle. (I would say well tuned).
test-part.3mf

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