3D viewing and measurement
Open incoming STEP / IGES / STL files quickly and move through shape review, section checks and measurement in one interface.
Product Information
Basic product, platform, supported format and download information.
| Product Name | StepGeomChecker |
|---|---|
| License | Freeware |
| Platform | Windows 10 / 11 64-bit |
| Supported Formats | STEP / STP / IGES / IGS / STL |
| Category | Manufacturing Review / Measurement Tool |
| Version | 2.4.0 |
| Last Updated | 2026-06-08 |
| Official Download | Download StepGeomChecker |
| GitHub Download | Download from GitHub |
| Package | Official ZIP package delivered from the LWJ download page |
| Package File | StepGeomChecker_Setup_2_4_0.zip |
What you can check
StepGeomChecker is intended for practical manufacturing review when a full CAD environment is not required for every user.
Key functions in Ver 2.4.0
V2.4 adds bounding box measurement for checking model extents with rectangular and cylindrical boxes.
Customizable workflow
LWJ can discuss feature additions and workflow-specific customization for manufacturing operations.
Need thumbnail-based cataloging?
If you need thumbnail-based browsing, organization and search for incoming or design data, see GeomCatalog. Used together with StepGeomChecker, it supports a smooth flow from catalog management to detailed inspection.
V2.4 Bounding Box
Check model extents with rectangular and cylindrical boxes. Use it for pre-machining review, quotation checks and outside-diameter / height checks for round parts.
Measurement modes
- Rectangular box for X / Y / Z model extents.
- Cylindrical box for outside diameter, height and axis direction.
- Visual overlay on the 3D model for quick shape-size review.
- Millimeter values shown in the viewer status area.
Result review
- Check stock-size and workpiece-envelope assumptions before machining.
- Review round parts with a cylinder-based envelope instead of only X / Y / Z extents.
- Use with existing measurement, section and view-orientation tools.
- Quickly compare model size with drawing or quotation requirements.
| Box types | Rectangular box / Cylindrical box |
|---|---|
| Main values | X / Y / Z dimensions, cylinder diameter, height and axis direction |
| Typical use | Model envelope checks, material-size review, quotation checks and round-part size review |
V2.2 Hole Check
Extract normal holes, counterbore holes and countersink holes from STEP / IGES models by condition and compare detected counts with expected counts.
Supported hole types
- Normal holes based mainly on cylindrical geometry.
- Counterbore holes with a larger counterbore and smaller pilot hole.
- Countersink holes with a conical entrance shape.
- Faces that form the same hole are grouped and handled as one feature where possible.
Result review
- Compare expected counts with detected counts and review OK / NG.
- Review hole type, through / blind status, pilot diameter, depth, counterbore diameter and countersink angle.
- Hole totals and individual hole results are integrated into the standard results screen.
- Save results, reopen them for the same model and export lists to CSV.
| Target range | Full model / selected part / selected subtree / currently visible range |
|---|---|
| Main conditions | Hole type, expected count, pilot diameter range, through / blind / unknown, counterbore diameter and depth, countersink outside diameter and angle |
| Hole check support | STEP / IGES only. STL is not supported for V2.2 hole checking. |
Screenshots
Main function screens for model inspection, measurement and manufacturing review.
Features
These functions are designed to support inspection, measurement and sharing in manufacturing workflows.
Main Functions
- Open STEP / STP / IGES / IGS / STL files.
- Bounding box measurement with rectangular and cylindrical boxes.
- STEP / IGES hole check for normal, counterbore and countersink holes.
- Expected-count comparison, hole totals, individual hole results and CSV export.
- Section view, perspective / ortho and wireframe / shaded display.
- Face distance, cylinder diameter, corner R, perimeter / area, edge length and center distance.
- Parts tree link, Hide Others and subassembly review.
- Measurement and hole-check results, memo editing and JSON auto save / restore.
- Weight settings, STEP colors and HTML report export.
Typical Uses
- Check model envelope and material-size assumptions before machining.
- Check hole counts in received STEP / IGES data.
- Compare drawing-specified hole counts with the 3D model.
- Review normal, counterbore and countersink holes separately.
- Shape review, section checks and dimension confirmation before machining.
- Part-level or subassembly-level hole checks.
- Save measurement sessions and share HTML reports with non-CAD stakeholders.
Who is it for?
Suitable when you need to inspect, measure and share 3D data in manufacturing work without using a full CAD system.
It fits manufacturing workflows such as incoming-data checks, pre-machining review, pre-quotation checks and geometry sharing with suppliers. The interface is intended to be approachable not only for engineers but also for non-CAD specialists involved in manufacturing operations.
Engineers
Use it for geometry review, section checks, dimension checks and quick inspection before design reviews.
Manufacturing Teams
Useful for pre-machining checks, reviewing 3D data received on the shop floor, and checking sections and dimensions.
Suppliers
Use it to inspect and share incoming STEP / IGES / STL data and make quick checks before contacting the customer or supplier.
Procurement and QA
Suitable for structure checks, dimension review, weight review and pre-meeting inspection.
System Requirements
Review the supported environment and usage notes before downloading.
Required Environment
- OS: Windows 10 / 11 64-bit.
- Architecture: x64.
- Supported Formats: STEP / STP / IGES / IGS / STL.
- License: Freeware.
- Package: Official ZIP download from the LWJ website.
Usage Notes
- Only one model can be displayed at a time.
- V2.2 hole checking is for STEP / IGES only.
- STL, threaded holes, tapped holes, slots and oval holes are not supported by the V2.2 hole-check function.
- Some automatic weight calculations are unavailable for STL because CAD volume is not available.
- If the path, size or timestamp changes, the model is treated as a different file.
- Always validate results with your own data before design, manufacturing or quotation decisions.
Version History
The current version and key updates are listed here.
v2.4.0 Page updated 2026-06-08
Added bounding box measurement for checking model extents with rectangular and cylindrical boxes, including X / Y / Z dimensions, cylinder diameter, height and axis direction.
v2.2.0 Page updated 2026-04-28
Added hole checking for normal holes, counterbore holes and countersink holes in STEP / IGES models. It supports target range and condition filtering, expected-count comparison, hole totals, individual hole lists, 3D view linkage and CSV export.
v2.0.0
Updated the Windows package and continued the free STEP / IGES / STL viewing and measurement workflow.
v1.0.0
Initial public release as a Windows 3D viewer and measurement tool for STEP / IGES / STL workflows.
FAQ
Common questions before downloading.
What is StepGeomChecker?
StepGeomChecker is a Windows 3D viewer and measurement tool for STEP, IGES and STL files. V2.4 adds bounding box measurement for checking model extents.
Which file formats are supported?
The viewer supports STEP, STP, IGES, IGS and STL files. V2.2 hole checking is for STEP and IGES models only.
Is StepGeomChecker free?
The current public package is provided as freeware from the official LWJ download page. The package is for Windows 10 / 11 64-bit.