A SolidWorks 2021 STEP file came into a CAD app missing 112 of its 294 faces, with loose patches scattered around the body. The reader took B-spline control points in [v][u] order instead of [u][v], so 79 patches failed the knot check and the square ones came in transposed. All 33 rational B-spline patches were rejected, B-spline faces were meshed over the whole untrimmed surface, and partial cones came out as full 360 degree bands at about twice their real area.
Recurring agent failure issue in vcad (muni-works)
What engineers report
A recurring agent failure problem in vcad (muni-works) that mostly hits the mechanical designer.
Failure pattern: validation / failure
Analyst note
From the Grok pain-radar digests, Nov 10-11 2026 (Nov 10 8:41 AM ET through Nov 11 7:41 AM ET digests plus the Haitch editions). Verified live 2026-11-11: issue/PR read; title and state confirmed.
What it costs a team
Modeled annual cost
$30,000
For a team of 5
Prototype delay
3 days
Modeled schedule slip per occurrence
Time lost
240 min
Per engineer per month, about 1 incidents
How the cost is modeled
240 min/month × 5 engineers × 12 months = 240 hours × $125/hour = $30,000
A modeled estimate with medium confidence. Swap in your own team size and loaded rate to size it for your team.
Engineering tools that address it
No engineering tool profile lists this error yet. Browse tools that connect to vcad (muni-works).
Evidence
More recurring errors in vcad (muni-works)
- An open-source CAD kernel audited STEP import against 21 public files from Fusion 360, Onshape, SolidWorks, FreeCAD and KiCad. Before the fix, 9 of 21 hung for over a minute, no file kept its colours, assemblies collapsed to one copy of each part at its local origin, and 4 failed STEP export. One root cause was ignoring a face-orientation flag that OCCT and KiCad StepUp write on nearly every face. After the fix, 20 of 21 match OCCT face counts, but most files still import as open shells.MCAD · impact 74
- Fab-prep converged on an incomplete board and the app reported 0 unrouted because the gate never checked whether the board was complete.ECAD · impact 74
- vcad's dogfood pass found a fillet that made the part vanish with no message, and a 111-part ECAD board that hung the app at 6.7 GB. A fresh window could not model anything because every tool was disabled behind a hover hint, and an edge fillet on a boolean result failed to resolve its edge name and the part disappeared silently. Failed features now undo and show the kernel's reason.ECAD · impact 66
Sourced from public community reports. Costs and delays are modeled estimates, not measurements. Know a better source or a fix? Tell us at hello@productflo.io.