Fusion 360 comes with various thread standards, most of which are not a great fit for 3D printing because they are too fine to work well when printed. This project defines thread profiles that are aimed at 3D printing so that they work, even when printed with lower detail settings (e.g. 0.30mm layer height).

The provided 3DPrintedMetricV2.xml file contains the thread profiles listed below. Additional profiles can be easily generated from the included Python script.

Shape: 60° trapezoidal Size (OD): 8-50mm Pitch: 3.5mm, 5mm Classes: O.0, O.1, O.2, O.4, O.8

The classes specify tolerances.

O.0 has the tightest tolerances which are loosely based on ISO M30x3.5 6g/6H. The number after the 'O.' specifies, in tenths of a millimeter, how much the major, minor and pitch diameters are offset compared to O.0. For example, O.2 would have a 0.2mm looser tolerance than O.0.

3DPrintedMetric.xml contains old thread definitions and is provided for compatibility with older prints or models.

If you just want to use the profiles with no customization, download the file 3DPrintedMetricV2.xml, save it in the following directory and then restart Fusion 360.

%localappdata%\Autodesk\webdeploy\Production\<version ID>\Fusion\Server\Fusion\Configuration\ThreadData

Macintosh HD> Users> [Username] > Library > Application Support > Autodesk > Webdeploy > production > [Version specific ID] > Then right click on "Autodesk Fusion 360" and choose Show Package Contents > Contents > Libraries > Applications > Fusion > Fusion > Server > Fusion > Configuration >ThreadData

(see also here)

When you now create or edit a Thread feature, you should be able to select the Thread Type "3D-printed Metric Threads".

Note: Profiles will need to be reinstalled after every Fusion 360 update. To do this automatically, check out the ThreadKeeper plugin.

Example command:

cp 3DPrintedMetricV2.xml ~/Library/Application\ Support/Autodesk/webdeploy/production/6997599ab67b7e881f25c2311930a0abc5af662e/Autodesk\ Fusion\ 360.app/Contents/Libraries/Applications/Fusion/Fusion/Server/Fusion/Configuration/ThreadData/

You can generate your own thread profile file using the main.py script. To execute the script, Python 3.9 or newer is required. The script has no parameters and can be executed like so:

python main.py

This will create a file named output.xml in the working directory which you can then rename and install in Fusion as described above.

To customize the generated profiles, simply edit the values defined at the top of main.py.

NAME = "3D-printed Metric Threads V2"
UNIT = "mm"
ANGLE = 60.0
SIZES = list(range(8, 51))
PITCHES = [3.5, 5.0]
OFFSETS = [.0, .1, .2, .4, .8]