# CADProps

> CADProps is a fast, free online CAD viewer for parts and assemblies, with STEP measurement and support for 55+ CAD file formats and extensions. No desktop CAD installation is required.

A feature-rich online CAD workspace brings viewing, measurement, model properties, assembly inspection, comparison, conversion and sharing together in one place.

CADProps helps mechanical engineers, CNC machinists and manufacturing suppliers inspect STEP/STP and other supported CAD files online. Use it to check part dimensions, review loaded assembly components and estimate material weight before CNC quotations and supplier handoffs.

Key capabilities include:

- Open STEP/STP files and inspect 3D geometry in a browser.
- Measure X/Y/Z dimensions, distances and supported geometric features; switch between metric and imperial display units.
- Calculate volume and surface area, and estimate weight using your chosen material density.
- Inspect supported assemblies and individual bodies with component selection, visibility controls, section views and exploded views.
- Compare CAD models visually; STEP pairs also support solid-difference analysis.
- Export model properties as CSV and download validated format conversions.
- Share completed 3D models by link, with optional password protection and browser access for recipients.

Supported formats include STEP/STP, IGES/IGS, STL, OBJ, 3MF, static GLB/glTF and supported DWG/DXF drawings. Native CAD files are read in-house, with results that depend on the format: Parasolid X_T/X_B and ACIS SAT/SAB are read as B-Rep; exact STEP export needs every face to be reconstructed. SolidWorks SLDPRT, Autodesk Inventor IPT and CATIA V5 CATPart give exact geometry and exact STEP export when the part's B-Rep is read completely; otherwise they show the display triangles saved in the file. SolidWorks SLDASM, Inventor IAM, Siemens NX PRT, JT, Rhino 3DM and Solid Edge PAR/PSM are shown from saved or tessellated display geometry with approximate properties, and their STEP export contains triangles rather than exact surfaces. CATIA CATProduct shows only the thumbnail saved in the file; Solid Edge ASM shows supported saved assembly scenes as an approximate preview, otherwise its thumbnail. Creo PRT/ASM, including numbered saves, are recognized and can show only their saved thumbnail: no Creo 3D geometry, measurement or STEP export. DWF/DWFx show read-only supported XPS/W2D vector pages or saved thumbnails, with W3D/HSF thumbnail-only, no CAD measurement/editing and displayed-page SVG export. Assembly references and multi-file resources can be packaged in ZIP.
3DXML XML tessellations, PLY triangle surfaces and static supported VRML97 WRL/VRML/WRZ scenes are approximate meshes with unverified units assumed millimetres. AMF flat triangle volumes apply declared units, defaulting to millimetres, normalized to millimetres. These four inputs support STL, OBJ, GLB, glTF, 3MF and tessellated mesh STEP export, not exact B-Rep. 3DXML binary representations, PLY point clouds, external VRML Inline content and AMF curved triangles are unsupported; incomplete scenes have no whole-model physical properties. SLDDRW, IDW, DFT, CATDrawing and Creo DRW/DRW.N show only saved preview images with unknown units: no drawing-view, dimension or title-block reading, 3D geometry, rotation, measurement, exact properties or model conversion. STEP STE/P21 and gzip STPZ, Parasolid XMT_TXT/XMT_BIN and IGES IGE are aliases with the same underlying capabilities.
ZIP or RAR4/RAR5 can package local assembly references, with normal limits of 50 entries and 200 MiB expanded. Encrypted and multi-volume RAR, unsafe paths and links are rejected; 7z is unsupported. Archive packaging does not enable unsupported geometry.

CADProps processes uploaded files on the server. Viewing and measuring are free and do not require an account; converting, saving files across devices and creating share links require sign-in. Share recipients do not need an account.
Guest uploads are automatically deleted about one hour after upload, or can be deleted earlier. Signed-in uploads are saved to private My files storage (200 MB, up to 100 files) and automatically deleted after 90 days without use by the owner. Opening a saved file or downloading its original starts a new 90-day period; viewing the file list or opening a share link does not. Owners can delete saved files anytime; their results are removed and their share links stop working too. Files and results that cannot be saved remain temporary.
The default upload limit is 95 MiB per file.

Data security: all traffic uses HTTPS with TLS 1.2 or 1.3 and HSTS. Automatic expiry and manual deletion remove the online originals, previews and calculated results. Deleting a saved file also disables its share links. Original CAD files are not sent to external CAD processing services and are not used to train AI models.
CAD viewing and inspection: open supported parts and assemblies quickly in one browser workspace. Inspect components, use section and exploded views, and check dimensions and available properties. Exact geometry properties and approximate mesh results are identified separately; availability depends on the file. Files are processed on CADProps servers.
Limits: 95 MiB per file, 200 MiB expanded ZIP, 10 files per upload, 2,000 bodies per assembly, 1,000,000 display triangles per preview and 120 seconds of processing per preview. In a 2026-10-06 production sample of 60 previews, the median time to a finished preview was 3.4 seconds and 91.7% finished within 10 seconds. A 50 MB public STEP assembly took about 35 seconds.
Best fit: machining and quoting staff, purchasing and supply-chain engineers, and incoming-inspection staff who need dimensions, volume, estimated weight, assembly contents or revision comparison without installing CAD software, including on a phone.
Full specifications: https://www.cadprops.com/specifications/
Trust and evidence: CADProps guides are written and reviewed by the CADProps team, cite relevant sources, and are checked on public CAD files with reproducible examples. Editorial policy: https://www.cadprops.com/editorial-policy/
Coverage: 3Druck.com (2026-09-27, German), 3D Printing Journal (Western Report #10, 2026-10-02), Stampare in 3D (2026-09-27, Italian) and 4Additive (2026-09-28) have written about CADProps; the Awesome CNC list on GitHub includes it in its CAD section. Details: https://www.cadprops.com/press/
Fast CAD viewing: https://www.cadprops.com/fast-cad-viewer/ shows real public parts and assemblies, screenshots and measured waiting times. In a single sequential production check on 2026-10-09, two public STEP parts showed their first visible 3D frame in 2.9 and 3.2 seconds after upload; an 11.38 MB Cabin ZIP showed visible 3D in about 20 seconds, with further loading to a final displayed result of 227,186 triangles across four components, marked incomplete. These observations are not a guarantee for every file.
Free test parts: https://github.com/cadprobs-a11y/cadprops-step-models has 30 parts in STEP, STL and IGES with envelopes and source records (CC BY 3.0 and CC0).
DWG and DXF tools provide 2D drawing preview, layer filtering, measurement and export.

Sharing creates a fixed snapshot of one completed 3D model for 7 or 30 days, with an optional password.
Recipients can view, section, inspect properties and measure without signing in, subject to format limitations.
The original CAD file is not offered for download.
Manage shares from the signed-in account. Deleting a saved source file revokes its share links.

Links below point to Markdown copies of public pages. Each copy names its HTML page.
Every public page, including localized pages and long-tail guides: https://www.cadprops.com/llms-full.txt

## Product and policies

- [Multi-Format CAD Viewer & Online Measurement Tools](https://www.cadprops.com/index.md): Quickly view and measure SolidWorks, NX, Inventor, CATIA, Parasolid X_T, SAT, JT solids, STEP, IGES and mesh formats online. Convert files and share 3D models by link with an optional password. Mesh measurements are approximate.
- [Online CAD Tools: Viewers, Measurement & Calculators](https://www.cadprops.com/tools/index.md): Explore CAD and mesh viewing, validated format conversions, dimensions, visual comparison and batch CSV export.
- [CAD Guides: STEP Measurement, Weight & File Formats](https://www.cadprops.com/guides/index.md): Practical notes on CAD formats, model properties, units and engineering handoffs.
- [Open CAD Files: Identify Formats and Resolve Import Problems](https://www.cadprops.com/workflows/open-cad-files/index.md): Choose a reader, preserve assembly references, and verify loaded scope before using a CAD model.
- [Measure CAD Properties: Units, Dimensions and Valid Volume](https://www.cadprops.com/workflows/measure-cad-properties/index.md): Check units, separate envelope from local measurement, and preserve unavailable results in property exports.
- [Convert and Hand Off CAD: Prepare, Verify and Compare](https://www.cadprops.com/workflows/convert-and-handoff/index.md): Choose a validated conversion, package references, and verify the output against the intended revision.
- [CAD Measurement Accuracy: Geometry, Units & Mass](https://www.cadprops.com/accuracy/index.md): Understand the geometry, units and assumptions behind every property.
- [CAD File Format Compatibility Matrix: View, Measure & Convert](https://www.cadprops.com/supported-formats/index.md): Compare supported CAD and mesh formats, assemblies, geometry properties, STEP conversion paths, limitations and downloadable test files.
- [How to Measure CAD Files & Export Model Properties](https://www.cadprops.com/how-it-works/index.md): A short workflow for a temporary task.
- [CADProps Specifications: Data Handling, Limits and Formats](https://www.cadprops.com/specifications/index.md): How CADProps processes and deletes uploaded CAD files, the file size and assembly limits, measured load times, supported formats and who the tool fits.
- [Terms of Service](https://www.cadprops.com/terms/index.md): The terms for using CADProps to view, measure, convert and share CAD files, including your rights, acceptable use and the limits of calculated results.
- [CADProps Press Coverage, Curated Lists & Directory Listings](https://www.cadprops.com/press/index.md): Articles that describe CADProps, curated resource lists that include it and directory listings, with dates, languages and how each piece was produced.
- [Advertise on CADProps: Sponsored Placements for CAD Products](https://www.cadprops.com/advertise/index.md): Sponsor the CADProps homepage, workspace, guides or tool pages to reach people who open and measure CAD files. Placements, rules and contact.
- [CADProps Editorial Policy: How Guides Are Written, Tested & Corrected](https://www.cadprops.com/editorial-policy/index.md): Who writes CADProps guides, which sources we cite, how we test claims on public CAD files, what the Updated date means and how to report an error.
- [Fast Online CAD Viewing with CADProps](https://www.cadprops.com/fast-cad-viewer/index.md): Open CAD parts and assemblies quickly in your browser with CADProps. View STEP and Inventor examples, inspect components and start your model review.
- [CADProps Connector for Claude: Inspect CAD Files](https://www.cadprops.com/connector/index.md): Add CADProps to Claude, upload a CAD file through a one-time link, check geometry properties, preview supported models and continue in the workspace.
- [STEP File Tools: Viewer, Dimensions, Volume & Conversion](https://www.cadprops.com/step/index.md): Open, measure and troubleshoot STEP/STP files with focused tools for dimensions, volume, surface area, weight, format comparison and conversion workflows.
- [SolidWorks File Tools: SLDPRT/SLDASM Viewer & STEP Converter](https://www.cadprops.com/solidworks/index.md): Open SolidWorks SLDPRT and SLDASM files online, troubleshoot missing assembly references, verify dimensions and convert supported geometry to STEP.
- [Siemens NX File Tools: PRT Viewer & STEP Converter](https://www.cadprops.com/siemens-nx/index.md): Open Siemens NX / UG NX PRT files online, identify ambiguous PRT sources, package assembly references and convert supported geometry to STEP.
- [CATIA File Tools: CATPart Viewer & STEP Converter](https://www.cadprops.com/catia/index.md): Open CATIA V5 CATPart files online from the geometry CATIA saved, check exact or approximate results and convert parts to STEP. CATProduct shows only its thumbnail.
- [Autodesk Inventor File Tools: IPT/IAM Viewer & STEP Converter](https://www.cadprops.com/inventor/index.md): Open Autodesk Inventor IPT and IAM files online, troubleshoot missing assembly references, verify dimensions and convert supported geometry to STEP.
- [IGES File Tools: Viewer, Area, Volume and STEP Conversion](https://www.cadprops.com/iges/index.md): Open IGES and IGS files, measure surfaces, and convert supported geometry to STEP. Volume exists only for valid closed solids.
- [JT File Tools: Viewer and Mesh Export](https://www.cadprops.com/jt/index.md): Open JT files online from their triangle geometry, check approximate dimensions and export STL, OBJ, GLB or mesh STEP. Exact JT B-Rep is not read.
- [Parasolid X_T and X_B Tools: Viewer, Measurement and STEP](https://www.cadprops.com/parasolid/index.md): Open Parasolid X_T and X_B files online, check bodies and units, and convert to exact STEP when every face is reconstructed, or to mesh STEP otherwise.
- [ACIS SAT Tools: Viewer, Solids and STEP Conversion](https://www.cadprops.com/acis/index.md): View ACIS SAT and SAB files, check solid dimensions, and convert to exact STEP when every face is reconstructed, or to mesh STEP otherwise.
- [Mesh CAD Formats: STL, OBJ, 3MF, glTF and GLB](https://www.cadprops.com/mesh-formats/index.md): Inspect STL, OBJ, 3MF and static glTF or GLB meshes. Units and closure differ by format. Mesh measurements are approximate and are not precise STEP solids.
- [About CADProps: Browser-Based CAD Tools from Singapore](https://www.cadprops.com/about/index.md): CADProps is an independent engineering software project started in Singapore in 2025. Who we are, why we build browser CAD tools and how we handle files.
- [Privacy Policy](https://www.cadprops.com/privacy/index.md): How CADProps keeps CAD files private, deletes them on schedule, and uses cookies and analytics.
- [Share CAD Models Online](https://www.cadprops.com/share/index.md): Share a fixed 3D CAD model with a 7-day or 30-day link and an optional password. View properties and measure in a browser without an account.
- [Online CAD File Converter](https://www.cadprops.com/convert/index.md): Convert supported CAD files to STEP, IGES or mesh formats online. Choose an output, upload a model and download the converted file without installing CAD software.
- [Free CAD Sample Files: STEP, IGES, STL & More](https://www.cadprops.com/examples/index.md): Download known-good CAD sample files for geometry, units, assemblies and viewer testing.
- [CAD Tools & Measurement Guides: Site Map](https://www.cadprops.com/site-map/index.md): Find tools, engineering guides and information about this release.
- [CAD Workspace: View, Measure & Compare](https://www.cadprops.com/workspace/index.md): View, measure and compare CAD files in the CADProps workspace. Inspect dimensions and available model properties, with measurement support depending on the file format.

## CAD tools

- [SLDPRT & SLDASM Viewer Online: Open SolidWorks Files](https://www.cadprops.com/tools/solidworks-viewer/index.md): Open SolidWorks SLDPRT files online and inspect supported SLDASM assemblies from ZIP. Check dimensions, loaded geometry and missing-component warnings without a SolidWorks install.
- [STEP Viewer Online: Open STP Files & Measure CAD](https://www.cadprops.com/tools/step-viewer/index.md): Open STEP and STP files in a real 3D viewer. Inspect parts, units and geometry, then move into focused dimensions, volume, surface-area and weight workflows.
- [X_T Viewer Online: Open Parasolid Files & Measure CAD](https://www.cadprops.com/tools/parasolid-viewer/index.md): Open Parasolid X_T files online in a browser, inspect solid geometry, check dimensions and properties, and convert validated models to STEP after registering or signing in. Viewing does not require an account.
- [IGES Viewer Online: Measure IGS Dimensions & Area](https://www.cadprops.com/tools/iges-viewer/index.md): Inspect IGES surfaces, solids and curve-only files using Open CASCADE. Read dimensions and surface area where surfaces exist; volume and mass require valid closed solids. Curve-only files use a wireframe preview.
- [STL Viewer Online: Mesh Dimensions, Area & Volume](https://www.cadprops.com/tools/stl-viewer/index.md): Open binary or ASCII STL files, inspect the triangle mesh and estimate dimensions, area and closed-mesh volume.
- [SolidWorks to STEP Converter: SLDPRT & SLDASM](https://www.cadprops.com/tools/solidworks-to-step/index.md): Convert SLDASM assemblies and SLDPRT parts to STEP online. Package SLDASM dependencies in ZIP and check missing parts and units before export. Sign in to convert.
- [Convert STEP to STL Online](https://www.cadprops.com/tools/step-to-stl/index.md): Convert STEP/STP CAD models to downloadable STL meshes. Check dimensions and choose the correct units before 3D printing.
- [X_T to STEP Converter Online: Convert Parasolid Files](https://www.cadprops.com/tools/parasolid-to-step/index.md): Convert Parasolid X_T files to STEP online, inspect the source geometry first, verify units and dimensions, and download the validated neutral CAD result.
- [Convert STEP to GLB Online](https://www.cadprops.com/tools/step-to-glb/index.md): Convert STEP/STP models to a downloadable GLB for 3D viewing. GLB contains mesh geometry, not an editable CAD feature tree.
- [CAD Weight Calculator: STEP Volume & Material Density](https://www.cadprops.com/tools/cad-weight-calculator/index.md): Estimate mass from valid STEP solid volume and your chosen material density. Inspect the model, verify units and download a property CSV without an account.
- [CAD Volume Calculator: Measure STEP Solid Volume](https://www.cadprops.com/tools/cad-volume-calculator/index.md): Calculate solid volume from STEP B-Rep geometry. Check model validity, source units and assembly scope before using or exporting the result.
- [STEP File Dimensions Online: Measure X, Y, Z & Distances](https://www.cadprops.com/tools/cad-dimensions/index.md): Get STEP file dimensions online, check X/Y/Z bounding extents, measure supported geometry and verify units before using CAD dimensions for engineering decisions.
- [CAD Surface Area Calculator: Measure STEP Geometry](https://www.cadprops.com/tools/cad-surface-area/index.md): Calculate surface area from STEP geometry, inspect individual parts and export the result in mm². Keep open surfaces and solid-volume requirements distinct.
- [Compare CAD Files Online: STEP Geometry & Properties](https://www.cadprops.com/tools/compare-cad-files/index.md): Compare two 3D models visually and inspect their properties. STEP pairs additionally support automatic solid differences.
- [Batch STEP Properties: Export CAD Measurements to CSV](https://www.cadprops.com/tools/batch-cad-processing/index.md): Process a batch of STEP files and export real dimensions, area, volume and density-based mass as CSV.
- [OBJ Viewer Online: Mesh Dimensions & Surface Area](https://www.cadprops.com/tools/obj-viewer/index.md): View OBJ triangle geometry and approximate dimensions, area and closed-mesh volume without an account.
- [Rhino 3DM Viewer Online: Open Saved Meshes](https://www.cadprops.com/tools/3dm-viewer/index.md): Open Rhino 3DM files online using saved meshes or tessellated NURBS geometry. Inspect file units and blocks; learn the limits for files without saved meshes.
- [3MF Viewer Online: Inspect Parts, Units & Dimensions](https://www.cadprops.com/tools/3mf-viewer/index.md): Inspect 3MF core triangle geometry with declared units and repeated component instances.
- [GLB Viewer Online: Inspect 3D Models & Dimensions](https://www.cadprops.com/tools/glb-viewer/index.md): Open a static GLB model and inspect geometry, base colors, scene instances and approximate dimensions.
- [glTF Viewer Online: Inspect Models, Units & Geometry](https://www.cadprops.com/tools/gltf-viewer/index.md): View static glTF 2.0 geometry. Upload embedded resources directly, or package local buffers and images in a ZIP.
- [CAD ZIP Viewer Online: Open Packaged 3D Models](https://www.cadprops.com/tools/zip-viewer/index.md): Upload a ZIP or single-volume RAR containing supported CAD models or a glTF scene with its local resources, then inspect the package in one workspace.
- [DWG and DXF Viewer Online: 2D Drawings & 3D Solid Preview](https://www.cadprops.com/tools/dwg-viewer/index.md): Open DWG and DXF files online. Inspect supported 2D layouts, layers and measurements, or preview detected 3D ACIS solids as a mesh. Native DWG write-back is not supported.
- [NX PRT Viewer Online: Open Siemens NX / UG NX Files](https://www.cadprops.com/tools/nx-viewer/index.md): Open Siemens NX or UG NX PRT files online, inspect converted geometry and dimensions, package assembly references in ZIP, and convert supported models to STEP.
- [NX PRT to STEP Converter Online: Siemens NX / UG NX](https://www.cadprops.com/tools/nx-to-step/index.md): Export Siemens NX / UG NX PRT files to a mesh STEP online from the display geometry saved in the file. Exact NX surfaces are not converted; check units and components.
- [IPT Viewer Online: Open Autodesk Inventor Parts & IAM](https://www.cadprops.com/tools/inventor-viewer/index.md): Open Autodesk Inventor IPT files online without installing Inventor. Upload IAM assemblies as a ZIP with their parts, measure dimensions, then export validated models to STEP.
- [IPT to STEP Converter Online: Autodesk Inventor Parts & IAM](https://www.cadprops.com/tools/inventor-to-step/index.md): Convert Autodesk Inventor IPT parts and supported IAM assemblies to STEP online. Package IAM dependencies in ZIP and verify units, missing references and geometry before download.
- [CATPart Viewer Online: Open CATIA V5 Part Files](https://www.cadprops.com/tools/catia-viewer/index.md): Open CATIA V5 CATPart files online from the geometry CATIA saved, check dimensions and convert to STEP. CATProduct files show only their saved thumbnail.
- [CATPart to STEP Converter Online: CATIA V5 Parts](https://www.cadprops.com/tools/catia-to-step/index.md): Convert CATIA V5 CATPart files to STEP online. Exact STEP needs a complete B-Rep; otherwise you get a mesh STEP. CATProduct is not converted.
- [SAT to STEP Online: ACIS Viewer & Converter](https://www.cadprops.com/tools/acis-viewer/index.md): Open ACIS SAT files and convert readable geometry to STEP. Check units, solids and export limits. View without an account; sign in to convert.
- [JT Viewer Online: Open JT Files & Export Mesh STEP](https://www.cadprops.com/tools/jt-viewer/index.md): Open JT files online from the triangle geometry stored in the file, check dimensions and export STL, OBJ, GLB or mesh STEP. Properties are approximate.
- [IGES to STEP Converter Online: IGS/IGES to STP](https://www.cadprops.com/tools/iges-to-step/index.md): Convert IGES/IGS files to STEP online. Open surfaces stay surfaces; volume is available only when the source is a closed solid.
- [Convert STEP to IGES Online: STP to IGS Exchange](https://www.cadprops.com/tools/step-to-iges/index.md): Convert STEP/STP models to IGES online. The IGES result is geometry exchange and does not guarantee the original assembly structure or solids.
- [Convert STEP to OBJ Online: STP to Mesh Output](https://www.cadprops.com/tools/step-to-obj/index.md): Convert STEP/STP models to an OBJ triangle mesh. OBJ does not declare reliable units, and the mesh is not an editable CAD solid.
- [Convert STEP to 3MF Online: STP to Mesh Geometry](https://www.cadprops.com/tools/step-to-3mf/index.md): Convert STEP/STP models to 3MF mesh geometry. Print profiles, materials and manufacturing instructions are not created.
- [Convert STEP to glTF Online: STP to Static Scene](https://www.cadprops.com/tools/step-to-gltf/index.md): Convert STEP/STP models to a static glTF mesh for viewing. The result is not an editable CAD model.
- [Convert STL to OBJ Online: Mesh to Mesh](https://www.cadprops.com/tools/stl-to-obj/index.md): Convert an STL triangle mesh to OBJ. The conversion does not recover a precise CAD solid or add reliable units.
- [Convert OBJ to STL Online: Mesh to Mesh](https://www.cadprops.com/tools/obj-to-stl/index.md): Convert an OBJ triangle mesh to STL. Check scale and whether the mesh is closed; the result is not a CAD solid.
- [Solid Edge Viewer Online: Open PAR, PSM & ASM Files](https://www.cadprops.com/tools/solid-edge-viewer/index.md): Open Solid Edge PAR, PSM and supported ASM files online. View approximate saved geometry, check units and missing parts, or use the saved thumbnail fallback.
- [Creo PRT / ASM File Check: Saved Thumbnail Preview](https://www.cadprops.com/tools/creo-viewer/index.md): Identify Creo PRT and ASM files, including numbered saves, and see the saved thumbnail when available. Export STEP from Creo for 3D viewing or measurement.
- [DWF / DWFx Viewer Online: Read-Only Published Pages](https://www.cadprops.com/tools/dwf-viewer/index.md): Open DWF and DWFx published pages online. View supported XPS or W2D vectors, otherwise saved thumbnails, and export the displayed page as SVG. No CAD measurement or editing.
- [3DXML Viewer Online: Open XML Triangle Meshes](https://www.cadprops.com/tools/3dxml-viewer/index.md): Open 3DXML files with XML or CATIA V5 binary (UVR) tessellations online, inspect placed components and missing geometry, and check unit limits. Exact B-Rep is unsupported.

## Guides

- [How to Calculate Volume from a STEP File](https://www.cadprops.com/guides/calculate-step-volume/index.md): Calculate volume from a STEP file using valid CAD solid geometry, verify units and body scope, diagnose unavailable results, and use volume safely for mass estimates.
- [Measure STEP Files Online: Dimensions, Distances & Units](https://www.cadprops.com/guides/measure-step-file/index.md): Measure STEP files online, check X/Y/Z dimensions, verify units, distinguish bounding boxes from local measurements, and record the geometry scope correctly.
- [STEP vs STL: CAD Measurement, Geometry and Accuracy](https://www.cadprops.com/guides/step-vs-stl/index.md): STEP and STL serve different jobs. Learn what changes when surfaces become triangles and which checks belong in a CAD handoff.