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32a4e0fb37
Prime towers reserved depth from the prime volume alone, ignoring the flush matrix: rib-wall towers in both the engine and the preview, and rectangle and cone towers in the preview, which never carried the flush-aware estimate the engine already used. The preview also read the print preset, which does not carry the printer- and filament-scope keys the estimate needs and so silently fell back to defaults. On multi-nozzle printers the flush matrix, which holds one block per nozzle, was additionally read as a single block. The tower could come out too small for the purge it has to hold. The flush-based estimate also skipped the height-based minimum depth that the prime-volume one applies, so low-flush prints could estimate a tower shallower than the one that actually gets built.