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solidcraft (tangency-labs)MCADConfidence: Medium

STEP export writes cylinder faces as analytic surfaces but their boundary circles as rational B-splines with no pcurves; OCCT projects them itself and lands about 8.1e-5 mm off at R31.5 against a 1e-7 mm edge tolerance. All 44 circular edges on a flange fail FreeCAD's strict check, and booleans and fillets downstream can misbehave.

Impact Analysis

Persona
Mechanical Designer
Team Size Impact
5x Multiplier
Prototype Delay
3 Days
Est. Annual Cost
$30,000
  • 1 user · 1 month240 min
  • Rest of team960 min
  • Rest of year13,200 min

monthly_minutes × 12 × team_multiplier ÷ 60 × $75/hr = $30k/yr

$75/hr assumed rate.

Annual team-minutes decomposed from the reported monthly inputs.

Evidence & Sources

1 Sources
tangency-labs/solidcraft Issue #8502: STEP export: circular edges written as rational B-splines without pcurves on CYLINDRICAL_SURFACE fail OCCT/FreeCAD check (InvalidCurveOnSurface)
github.com
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Analyst Notes

From the Grok pain-radar digests, Oct 28-29 2026 (Oct 28 8:41 AM ET through Oct 29 early-morning Haitch editions). Verified live 2026-10-29: issue/PR read; title and state confirmed.