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An ironing line spacing of 0 reached the fillers from a 3MF, the CLI or the per-filament override, which has no GUI guard. Concentric ironing then never finished slicing, because a zero inset never shrinks the region, and rectilinear ironing was silently dropped. Tiny positive values produced an unprintable number of lines. Top surface and support ironing now clamp the spacing to the 0.05 mm floor the process GUI guard already enforces, so these configurations iron at that spacing. Spacings at or above the floor, including every shipped profile, are unchanged. The concentric filler also returns early on a non-positive step so no other caller can hang it, and the filament settings page now resets a too-small override the same way the process page does.