Custom made ISO Metric Thread Profiles for Fusion 360 with additional tolerances for better 3D printability.
See the full blog writeup here: 3D printing threads is hard! Custom Threads in Fusion 360 makes it easy! – ReplicantFX
TLDR: Full set of ISO Metric profiles for creating threads in Fusion 360 with custom tolerances to allow for reliable 3D printing of threaded objects.
3D printed threads that work is a bear, resulting in unpredictable outcomes and functionality. Fusion 360 has no built-in ability to customize threads and makers usually resort to hacking tolerance onto threads through scaling or some equally imprecise adjustment to compensate for the nature of 3d printed parts.
Fusion does allow for custom threads (If you look deep enough in its file structure) but it is not for the faint of heart or time compressed maker. It took me a while to work out the details, but I created a range of custom ISO metric thread profiles for Fusion 360 that have the extra tolerance you need.
This download contains ISO Metric Profiles optimized for 3D printing with tolerances ranging from 0.1mm to 1.0mm.
Once downloaded and unzipped, place the *.xml containing the custom profiles in the following folder:
C:\Users\%UserName%\AppData\Local\Autodesk\webdeploy\production\%Hash of Version%\Fusion\Server\Fusion\Configuration\ThreadData
When Fusion updates, you will need to copy the files into the new version’s folder.
Restart Fusion if it was running and thread your part normally with Fusion 360’s thread tool. Be sure to select “modeled” on the feature settings and to select the tolerance profile you want.
This download will also provide 9 test nuts and bolts (As seen in the blog post: https://replicantfx.com/custom-threads-with-fusion-360/). These are attached as a *.stl and a *.f3d file. These use Metric M14-2 threads and have tolerances ranging from 0.0 (Standard) to 0.8mm in 0.1mm steps (Each is marked with the corresponding number of dots/cutouts, 1 for 0.1mm – 8 for 0.8mm). Using an Ender 3 and PETG I printed this set of nuts and bolts to test what tolerance and found 0.5mm to be perfect.
Once downloaded you are free to use these tools as many times as you like (For business or personal), but please respect the substantial time to research and produce these files and do not share.