# CAD Guides: STEP Measurement, Weight & File Formats

Practical notes on CAD formats, model properties, units and engineering handoffs.

- [Annotate a CAD Model Online and Share Review Notes](https://www.cadprops.com/guides/annotate-cad-model-online/index.md): Place numbered notes on a 3D model, return to saved viewpoints, and include saved annotations in a new CADProps share link.
- [Export STEP Properties to Excel: Batch CAD Measurements](https://www.cadprops.com/guides/batch-cad-properties-to-excel/index.md): Design a useful batch report with one row per defined item, explicit units, material inputs and an exceptions list.
- [Prepare a STEP File for a CNC Quote: A Shop-Ready RFQ Checklist](https://www.cadprops.com/guides/prepare-step-file-for-cnc-quote/index.md): Check STEP geometry, units, holes, revision, drawing requirements, material and quantity before sending a CNC machining RFQ, without assuming the 3D model contains every manufacturing requirement.
- [Share CAD Files with Suppliers: STEP Handoff Checklist](https://www.cadprops.com/guides/share-cad-files-with-suppliers/index.md): Prepare a small delivery package that identifies the model revision, intended use, units and any excluded components.
- [Threads Missing from a STEP File? Geometry, PMI and Shop Handoffs](https://www.cadprops.com/guides/threads-missing-from-step-file/index.md): Understand why thread callouts can disappear in STEP handoffs, how modeled and cosmetic threads differ, what AP242 PMI can carry, and what to send a machine shop.
- [CAD File Conversion Checklist: Units, Solids & Accuracy](https://www.cadprops.com/guides/cad-conversion-checklist/index.md): Reopen the output, verify scope and units, inspect critical geometry, and include a short record of what was and was not checked.
- [How to Convert NX PRT to STEP: Units & Assembly Checks](https://www.cadprops.com/guides/nx-prt-to-step/index.md): Convert Siemens NX or UG NX PRT files to STEP with a repeatable check for source identity, units, assemblies and the converted geometry.
- [STL Export Settings: Mesh Resolution, Units and Scale](https://www.cadprops.com/guides/stl-export-settings/index.md): Choose tessellation settings for the receiving task and verify curved features, thin regions and units after exporting.
- [Autodesk Fusion AutoTimeline: Why CAD Feature Recognition Matters Again](https://www.cadprops.com/guides/autodesk-fusion-autotimeline-feature-recognition/index.md): A CADProps engineering note on Autodesk's September 2026 AutoTimeline announcement, imported-geometry feature recognition, and why explainable geometry checks still matter as AI moves deeper into CAD and CAM.
- [3MF vs STL: Units, Multiple Parts and Mesh Handoff](https://www.cadprops.com/guides/3mf-vs-stl/index.md): Compare 3MF and STL for mesh exchange, including declared units, packaging, multiple objects, metadata and what CADProps can actually inspect from each format.
- [GLB vs glTF for CAD: 3D Model Files, Assets and Units](https://www.cadprops.com/guides/glb-vs-gltf-for-cad/index.md): Use a display derivative for the web while keeping engineering geometry and revision records separate.
- [JT vs STEP: Lightweight Collaboration or Neutral CAD Exchange?](https://www.cadprops.com/guides/jt-vs-step/index.md): Compare JT and STEP for visualization, precise geometry, supplier collaboration, product structure and cross-CAD exchange, including the current CADProps JT solid workflow.

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