Optical path spacers v1.0.0

Printable25,50 and100mm added stop-spacing modules for the keyed optical fixture. Includes editable portable OpenSCAD, exact STL meshes, assembly/printing guidance, actual-CAD previews and CERN-OHL-S-2.0 licensing.

Nominal CAD compatibility checks passed for cradle, spacer-chain and revised stand interfaces. Physical spacer fit and measured optical/positioning performance remain untested. Labels describe added stop spacing, not total part length or refractive optical path. Slice STLs for your printer; no spacer G-code supplied.

Zenodo version DOI: https://doi.org/10.5281/zenodo.23609527
All-versions DOI: https://doi.org/10.5281/zenodo.23609526
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