StackUp 3D by Metafold / 3D tolerance analysis
Find fit risks in your 3D assembly. Explore clearances, interference and tolerance choices in desktop software built for mechanical engineers.
Mouse / XY section / Two wheel-to-housing gaps
+0.375 → −0.049 mmtarget reduction in
tolerance-analysis time
The cost of waiting
Resolve fit risks before they become tooling changes, costly rework or launch delays.
The old process: Weeks spent setting up and running studies
With StackUp 3D: 80% less analysis timeOur time-reduction target
The old process: Engineering hours lost rebuilding stackups
With StackUp 3D: Lower analysis costsPut engineering time into design decisions
The old process: Fit problems found after design freeze
With StackUp 3D: Get ahead of reworkFind fit risks while changes are practical
The old process: Late changes that push back launch
With StackUp 3D: Protect the launch scheduleResolve fit questions before committing to tooling
The 80% reduction is a target. Measure the savings on your own assemblies.
Estimate your savingsDeterministic calculations, built on geometry and math.
Work directly with your assembly to inspect gaps and compare tolerance choices.
USB-C study 01 / Outer-shell fit
The parts can meet their size limits and still clash when they’re misaligned. See how a locating change recovers clearance.
Local interference
Local clearance
Same size limits. Offset reduced from 30 to 5 µm.
Illustrative rigid-shell fit study.
USB-C study 02 / Inside the contact array
Give every contact room. Follow the clearance between two neighboring contacts, then see how a positioning change recovers 40 µm of space.
Same maximum contact widths. Both gaps stay positive.
175 µm is the minimum chosen for this illustrative study.
Tolerance analysis, explained
Manufactured parts vary in size. Tolerance analysis shows how that variation affects their fit.
Nominal gap / Nominal sizes
20.00 − 19.70 = +0.30 mm
The intended sizes leave a 0.30 mm gap.
Import STEP geometry, set tolerances and inspect the gaps that matter.
Three assemblies. Three fit questions.
Explore three fit questions, then inspect the inputs and results.
Illustrative distance field; part positions stay nominal.
Mouse assembly / Wheel & housing
A gap in nominal CAD can disappear with variation. Zoom into the wheel-to-housing interface to see the assumed tolerances consume the clearance.
Find the interface that needs attention.
Illustrative distance field; part positions stay nominal.
Inspect the studyEngine assembly / Washer, adapter & sprocket
The washer spans an adapter and a sprocket. Compare their tolerance envelopes to see how locating inputs affect the local gap.
Identify the locating control to investigate.
Illustrative rigid-pose comparison.
Inspect the studyCrossmember → support connectionFollow the locator change
Seat frame / Crossmember & support
Tightening the center-locator input changes the minimum gap from −0.400 mm to +0.100 mm in this one-axis study.
Bring a specific tolerance change to the design review.
Illustrative bounds for one connection and one axis.
Inspect the studySee what changed at each interface.
Inspect the studiesInside the engineering decision
Compare the inputs, results and measurement locations.
Showing mouse study evidence.
The engineering question
Change the surface input on both parts while keeping their positions fixed.
| All values in mm | Initial | Revised |
|---|---|---|
| Surface tolerance input, each part | 0.000 | 0.300 |
| RSS-adjusted gap at the selected witness | +0.375 | −0.049 |
Nominal gap at the selected witness: 0.375 mm.
What this informs
The assumed variation consumes the local gap. Check the locating relationships before setting production tolerances.
From geometry to a decision
Measure gaps between selected parts in the assembly.
See where tolerance variation can cause interference.
Compare inputs to focus the next design change.
Your tolerance-analysis workload
Start with the early-design analyses you already perform. Estimate the engineering time you could release, then compare its value with the cost of adopting StackUp 3D.
If time constraints prevent analysis today, bring those missed checks into the evaluation. Their value is in the design decisions they inform; it is not counted as savings from work you never performed.
Enter the portion of your current annual TA workload you would use StackUp 3D for.
Engineering hours released / year
Enter all three nonnegative costs within the input limits. Use zero where no cost applies.
A STEP assembly, a fit question and tolerance inputs to explore. You can investigate while the design is still evolving.
StackUp 3D supports early design decisions. Detailed GD&T and release-stage verification remain part of your engineering process.
Deterministic geometry and mathematical calculations. The same study inputs produce the same results, without a trained model.
StackUp 3D is a desktop application for STEP assemblies. Deployment, training and integration requirements are scoped with your team.
Start with a demo and a discussion of your fit question. A paid Proof of Value on your own assembly establishes the technical scope and business value before an annual enterprise license.
See it on your assembly
Start with a demo. Then choose a real assembly for a paid Proof of Value, with success criteria agreed before the work begins.
Tell us about your fit question. We’ll follow up to arrange a demo.
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