Hi,
Haven't seen your question because i haven't logged in for several days.
Yes that is possible to do in Fusion 360, and its fairly easy once you know they right procedure or steps to take.
STLs in general are very difficult to modify directly, and although Fusion has that capability, its just... road to a lot of suffering.
But if you use a STL only as a reference and make a separate model, or a "body", using Fusion basic modeling tools then its maybe even easier then doing something from scratch.
There are two basic ways on how to do it. You can trace the contours of the edges of your STL in a starting sketch and then connect them using a "Loft" tool. The shape in between these starting lines, t-splines or whatever lines you use will be formed according to Fusion algorithms so may not be exactly like the stl whole model. So it will require further adjustments. You can make additional curved lines, even 3D lines to use as "rails" which will tell fusion to Loft two basic sketches along those curves. Or you can try using Sculpting tool and build a whole model from the start, while using STL as a reference. Its too difficult to describe in a message like this but there are many tutorials on youtube on how to use this tool, and others.
I made my mask in a way where i combined these two approaches, although i had to make several models and try them out and them adjust the design until i got the final shape. So... i made a t-spline curved line (flat 2D line for starters) of what i wanted to be the edge touching the face. And i made a separate sketch - drawing of the filtering part, or the mouth part. Then i used "Loft" to connect the two, which gave me the basic 3d model. I used the Loft tool inside the surfaces tab which creates only the shell of a 3d model, not a full body. Then i switched to Sculpting and converted that surface shape into a t-spline body. (that usually requires increasing the number of polygons in the pop up menu until the resulting shape is almost the same as what you want, if the number of polygons is small the form will not bend sufficiently). That allowed me to use Sculpting editing options to additionally deform it. Little by little. Carefully.
If you the F3D file i posted you can see the whole procedure in the "timeline" except individual Sculpting steps, since Fusion doesnt them individually.
You should also try and find some new, recent tutorial on how to maybe convert STL files into Fusion 3D bodies... that may work. I haven't checked that for a long time so maybe they improved that function.
- 0 j’aimes
Hmm... maybe, this is just a guess... Make a big basic box that envelopes your stl completely. Position Stl inside it or the box around it. Make it a full 3d body. Then try cutting that box body and select the stl as the cutting tool. Only dont choose "Cut" but "intersect" instead.
You may need to convert the stl into some other type of "body" first.