Offline rebuild only; no network or printer dispatch.
1. Open 3MF as a PrusaSlicer project, retaining scale, orientation and two meshes. There are no native contact handles. Any edit needs new contact/removal review.
2. Export fresh SL1 and check critical native layers/all selected issues.
3. Convert SL1 to CTB v4 with UVtools.
4. Apply the engineering profile into a NEW file:
python3 ctb_apply_profile.py input.ctb ../Profile/Engineering-reference-UNCALIBRATED.ini --output new-UNCALIBRATED.ctb
5. Recheck every raster, layer parameter, mirror, RLE roundtrip and selected final issues. A rebuild is not itself a validation. Do not repatch the supplied digitally checked CTB merely to open it. Firmware and physical calibration remain unverified.
