I have started designing assembles in Fusion 360 using T-Slot, a lot of head scratching on how to make use of it at arbitrary lengths in my designs…
I started by making a 20mm length of T-Slot as its own model in Fusion 360; This is model has all of its materials and properties defined, as well as dimension origins added in additional sensible locations.
If you download either the T-Slot model or the 8mm stainless rod model, you can treat them them the same once they are imported.
I have put together a quick video showing you how to work with them:
You can find all my Fusion 360 and 3D models on Thingiverse here.