nx_estimate.nx

nx_estimate.nx -- pre-print operator visibility (filament + time). Closes the operator question "is this a 10-min print or 18 hours?" BEFORE committing to a slice + upload. Industry slicers show time + filament in their preview pane; substrate provides the same info without the full slice cost. Algorithm (rough but fast, sub-millisecond): 1. Compute mesh bbox volume (mm³) 2. Estimate solid printed volume = bbox × (perim_factor + (1 - perim_factor) × infill_pct / 100) 3. Filament_mm = solid_volume / filament_cross_section_mm² 4. Print_minutes = solid_volume / typical_flow_mm³/s / 60 More accurate version (queued v2): run nx_print_session_run + read emitter.E_acc_q14 + count G-code lines. v2 is exact but slow; v1 is rough but instantaneous (operator can call BEFORE deciding to commit to the full slice). Verdicts surface operator-actionable warnings: OK -- print is reasonable WARN_LONG -- > 24h estimated (operator should reconsider scope) WARN_FIL -- > 250m estimated (typical PLA spool is ~330m for 1kg) WARN_TINY -- < 1g of filament (probably too small to print) Per [[feedback-engineering-sciences-bits-up-3d-print-first]]: pre-print visibility is operator's right; substrate composes nx_mesh bbox + nx_gcode_extrude filament-cross-section helper to answer without third-party slicer dependency. license_tier: ORIGINAL