Article

Repair Cost Comparison for LMD Repairs

The repair cost tool compares replacement and repair by combining price, downtime, lead time, additional repair costs and an uncertainty allowance.

Industrial metal component prepared for repair or rebuild

In brief

The short answer.

The repair cost tool compares replacement and repair by combining price, downtime, lead time, additional repair costs and an uncertainty allowance.

A good fit when

When it is a good fit.

Localized wear or damage sits on a valuable part with a defined functional zone.
Replacement is expensive, slow or tied to downtime.
Repair can be validated with finishing and inspection.

Consider another process when

When another process may be better.

The base material, failure mode or remaining substrate is unclear.
The part is cheap to replace and repair creates no real advantage.
There is no credible inspection or acceptance plan after repair.

Decision table

Key criteria for the process choice.

Decision table with decision point, good sign and escalation signal.
Decision point	Good sign	Escalate or avoid
Damage zone	Localized wear, edge loss or material drop-out.	Widespread damage or unclear remaining strength.
Replacement situation	Long lead time, high part value or strong downtime pressure.	A standard replacement is quickly available and clearly simpler.
Material pairing	Base material and buildup alloy can be assessed technically.	The substrate or prior condition is not known with confidence.
Acceptance	Finishing, dimensional recovery and inspection can be planned.	The repair may look plausible but cannot be validated credibly.

In summary:

Useful when: Localized wear, edge loss or material drop-out.
Clarify first: Widespread damage or unclear remaining strength.

Comparable project

A related published case study.

Nobufil Extrusion Screw Repair: Short-Lead-Time LMD Rebuild of a Cracked Stub Shaft

Nobufil Extrusion Screw Repair: Short-Lead-Time LMD Rebuild of a Cracked Stub Shaft is a published project example for the process, material and inspection questions in Repair Cost Comparison for LMD Repairs.

Open related case study

Material and quality

What needs to be reviewed alongside the process.

Material

Base material, HAZ risk and the mixed zone shape the repair approach.
The filler alloy has to fit the repaired function, not only deposit easily.

Quality

Repair quality needs more than visual approval: dimensions, surface, bond quality and, where needed, NDT.
Acceptance criteria should be defined before deposition, not after finishing.

Inspection and acceptance

Checklist for the enquiry and acceptance plan.

Photos of the damage zone
Base material and prior condition
Target geometry or reference dimensions
Replacement cost or downtime window
Acceptance criteria after repair

Repair decisions are rarely based on repair price alone. Replacement lead time, downtime and technical uncertainty can materially change the comparison.

The short answer

The Exafuse repair cost tool compares total replacement cost with total repair cost. Replacement includes the part price and downtime during delivery. Repair includes the initial estimate, finishing and inspection allowances, an uncertainty factor and downtime during the repair period.

The formula

Total replacement cost = replacement cost + (downtime cost per day x replacement lead-time days)
Total repair cost = (repair base estimate + repair extras) x (1 + uncertainty buffer) + (downtime cost per day x repair lead-time days)
Cost difference = total replacement cost - total repair cost

If the difference is positive, repair may merit technical investigation. If it is negative, replacement may be commercially competitive. Neither result determines technical feasibility.

Break-even downtime

The tool also shows the daily downtime cost at which repair begins to offer a commercial advantage, provided repair is faster. If it is not faster, the break-even field makes that limitation visible.

Why the uncertainty buffer exists

Repair carries technical uncertainty: hidden damage, additional machining or greater validation needs can change the scope. The uncertainty allowance makes that early uncertainty visible and avoids false precision.

When the comparison is useful

It supports an initial discussion between maintenance and procurement before the component is submitted for technical review.

What the comparison cannot establish

It cannot prove that repair is feasible, lower risk or technically approved. Component condition, base material, access, machining and inspection still require review.

Inputs that matter most

Replacement price, lead time, downtime cost, repair estimate, finishing/inspection extras and the chosen uncertainty buffer all change the result materially.

Next step

Use the repair cost tool, then review the repair-versus-replacement guide, cost estimator, RFQ builder or repair and modification service.

Common project questions

Questions that often arise in similar projects.

Is repair technically better than replacement here?

That usually turns on damage limits, replacement cost, lead time and whether the repaired result can be validated cleanly.

What does Exafuse need for a repair review?

Photos, base material, target geometry, a short failure description and the delivery window are usually enough to start.

When should a repair be rejected?

If the substrate, remaining strength or acceptance criteria are unclear, a clear no is often more credible than a speculative repair proposal.

Recommended next steps

Clarify the next technical question.

Use the linked pages to assess damage zone, base material and target geometry for Repair Cost Comparison for LMD Repairs.

Next step

Assess a repair.

Send photos, base material and the required final geometry.

Request a repair assessment

Business caseCompare repair with replacement Cost overviewReview the main cost drivers Initial assessmentClarify the next step Direct contactRequest a Teams or phone call

Technical overview

Key technical points at a glance.

CompanyExafuse / ThinkIng - Additive Technology GmbH

FocusRepair Cost Comparison for LMD Repairs

Key questionHow is repair ROI for LMD evaluated when downtime, replacement cost and risk all matter?

Suitable whenLocalized wear or damage sits on a valuable part with a defined functional zone. / Replacement is expensive, slow or tied to downtime.

Not suitable whenThe base material, failure mode or remaining substrate is unclear. / The part is cheap to replace and repair creates no real advantage.

Required input dataPhotos, base material, target geometry, machining allowance

Related serviceRepair service

Related toolCompare repair with replacement, Review the main cost drivers, Clarify the next step

Related case studyNobufil Extrusion Screw Repair: Short-Lead-Time LMD Rebuild of a Cracked Stub Shaft

ContactFeasibility request

Project-specific limitsPublic technical context, not final engineering approval.

Publication details

Authorship and technical context.

Revision 1.0

Published: April 2026
Last technical review: April 2026
Page scope: Tool methodology or illustrative example

Author

Julian KrellMaterial scientist and managing director

Material selection, feasibility and project scope

Technical reviewer

Manish SharmaIndustrial AI and decision systems

Process monitoring, image processing and LMD/DED data systems

Reference basis

Exafuse tool methodology

The methodology supports initial screening and does not replace a technical feasibility review.

Next step

Assess a repair.

Send photos, base material and the required final geometry.

Request a repair assessment Start RFQ builder

Repair Cost Comparison for LMD Repairs

The short answer.

When it is a good fit.

When another process may be better.

Key criteria for the process choice.

A related published case study.

What needs to be reviewed alongside the process.

Material

Quality

Checklist for the enquiry and acceptance plan.

The short answer

The formula

Break-even downtime

Why the uncertainty buffer exists

When the comparison is useful

What the comparison cannot establish

Inputs that matter most

Next step

Questions that often arise in similar projects.

Clarify the next technical question.

Related pages and tools

Assess a repair.

Key technical points at a glance.

Authorship and technical context.

Assess a repair.