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Adds the `imex_firmware_managed_zones` printer-config key (default off) for IDEX/IQEX printers whose firmware applies its own copy/mirror offsets in non-primary modes (e.g. RepRapFirmware IDEX duplication mode, Flashforge Creator Pro 2/3 Pro). For these printers the slicer needs to emit a single centered slice at bed origin and let the firmware fan toolheads out from there; the previous slicer-managed iMEX rendering would draw a print at the primary zone's world position (off-bed for the firmware-fan-out paradigm). When the flag is on and the active mode is non-primary, the slicer subtracts the primary zone's plate-local center from the gcode emission frame. The writer offset is augmented but the gcode-processor offset stays at plate_origin so the gcode-preview visualizer renders the centered slice at the bed center rather than at the prepare-view zone placement. translate_to_print_space is augmented too so first_layer_print_min/max placeholders (consumed by user start_gcode like Felix's M118 header) reflect the centered frame. Slice handoff lives in PartPlate::refresh_imex_slice_offset, called from both update_slice_context (plate switch) and Plater::priv::update_background_process (every-slice path — reslice() goes through here with switch_print=false so the plate-switch hook alone wouldn't fire on mode toggle). calc_imex_ghosts early-returns in firmware-managed mode: the existing imex_head_transform math places ghosts at primary_zone_center + gantry_offset (slicer-managed semantics), which renders off-bed when the toolpath is being emitted in a centered frame. Proper firmware-managed ghost rendering (showing where copies/mirrors will actually print after firmware fan-out) is deferred. When the flag is off, all the new code paths reduce to no-ops byte-identical to prior behavior. Layer 1 unit tests in test_imex_helpers cover every gating path of compute_imex_slice_offset; full ctest suite passes (247/247). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>