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Clifford GarwoodandClaude Opus 5
3852f4be61
IMEX placement validation only walked model instances. The prime tower is not a ModelObject, so it could sit in a secondary zone or a carriage collision strip and slice with no warning -- on mirror mode, a carriage crash. Span (paired-gantry multicolor) is what made towers reachable in parallel modes, so this is a gap in that feature, not inherited breakage. The check now returns a cause instead of a bool so the message can name the offender, and the tower and per-instance paths share one predicate, imex_hull_violates_zones(), moved to libslic3r and covered by tests. Overlap is area-based: a hull flush against a zone boundary is legal, only a crossing violates. The tests pin that in both directions, since switching to a touch-based test would silently block placements that work today. The tower footprint comes from the same estimate the scene draws, so validation matches what the user sees and drags. Three config reads there are load-bearing in non-obvious ways and are commented at the point of use. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>