One-click sketch geometry checks for Fusion 360
Geometry Check finds near-square lines, hairline gaps, and open endpoints in your sketches so you stop hunting for why an extrude fails.
- LinkLoot access
- Free
- Provider costs
- Unknown
What you get from it
What it does
Fusion 360 sketches often fail to extrude because of tiny errors: a line 0.3° off square, two endpoints 0.05 mm apart, or a sliver segment left over from an import. Geometry Check is a free add-in that scans every sketch in the active design and flags these problems with plain-language explanations. Click any finding and the camera jumps straight to it.
The current checks cover four categories: slightly-off right angles (within 0.5° of square but not exact), hairline gaps between endpoints, open profile endpoints connected to nothing, and tiny segments far below the sketch's scale. Construction geometry and projected entities are excluded automatically. Every tolerance is tunable in Settings.
By default the tool only detects — it never changes your geometry. An opt-in experimental mode adds a Fix button that applies the appropriate constraint as a single undo step, then re-checks the sketch. If the fix causes a new problem or breaks a feature rebuild, it rolls back automatically. The README warns this path is untested in real-world use; save your design first.
Some near-misses are intentional — a draft angle, a deliberately open path. One click marks a finding as ignored, hides it from future scans, and stores the flag as metadata inside the .f3d file with no geometry change.
Who it helps
Anyone who builds parts in Fusion 360 and loses time zooming into endpoints trying to figure out why a profile won't close or an offset keeps failing. It's especially useful after importing STEP files or DXFs where stray geometry creeps in unnoticed.
Getting started
Download the latest GeometryCheck-vX.Y.Z.zip from the project's Releases page and unzip it. In Fusion 360, go to Utilities → Add-Ins → Scripts and Add-Ins, click + next to My Add-Ins, and select the extracted GeometryCheck folder. Run it once, optionally ticking Run on Startup. Three commands appear under Inspect: Scan (whole design), Diagnose Selection (selected sketches only), and Settings.
Limits and costs
This is public alpha software, MIT-licensed and free. Developed and verified on macOS; Windows is untested though nothing platform-specific was found during an audit. Duplicate curves, self-intersections, and body/topology checks are on the roadmap but not yet available. The experimental fix mode carries real risk since it has limited field testing.
Source links
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