STL/Mesh to Solid in Fusion 360 - Reverse Engineering Workflow

Turn an STL mesh into a real, editable solid in Fusion 360 — no mesh-to-solid conversion, and no tracing jagged section sketches by hand. The workflow: slice the STL into cross-sections with Cutaway (a free browser tool), fit those sections into clean arcs and lines, then import everything into Fusion 360 with a free Fusion 360 add-in, every sketch lands on the exact plane where it was cut, ready to extrude, revolve or sweep. At the end I overlay the original mesh on the finished solid to verify the rebuild, and catch a real mistake. Everything shown also works with Fusion 360 for Personal Use (the free version). 🔗 Links Cutaway (free, runs in your browser): https://cutawayhq.com Slice app: https://slice.cutawayhq.com Fitting app: https://fit.cutawayhq.com Fusion 360 add-in (free): https://github.com/cutaway-hq/fusion-... Blog: https://cutawayhq.com/blog/ ⏱ Chapters 0:00 The goal — STL to clean solid 0:23 Why not do it natively in Fusion? 1:01 The two web apps: Slice & Fitting 1:18 Loading the STL & planning the cuts 1:50 Cutting the sections (face, planar, references) 2:52 Inspecting & cleaning up sections 3:53 Export → import into the Fitting app 4:02 Fitting contours: arcs & lines 5:42 Constraints: concentric, equal radius, parallel 7:01 Fitting the reference & chamfer sections 7:53 Importing into Fusion 360 with the add-in 8:53 Modeling over the sketches 10:56 Chamfers from measured dimensions 11:48 Verifying against the original mesh 13:05 Wrap-up Who this is for: 3D-printing folks, makers, and engineers who have an STL, downloaded, scanned, or a part whose source file is long gone, and want a clean, parametric CAD model they can actually modify. Got a part you'd like to see reverse-engineered? Tell me in the comments. #STLtoSolid #ReverseEngineering #Fusion360