A46 / Article

Example: Why SLM Fits Compact Internal-Channel Geometry

SLM / LPBF usually becomes the stronger candidate when the value sits in compact geometry, internal channels and fine integrated detail that LMD would recreate inefficiently or not at all.

Powder-bed fusion visual for SLM comparison

Answer at the top

One-sentence buyer answer.

SLM / LPBF usually becomes the stronger candidate when the value sits in compact geometry, internal channels and fine integrated detail that LMD would recreate inefficiently or not at all.

Use it when

When to use it.

The page is being used to clarify inspection, documentation or release logic for LMD, repair or cladding.
The risk sits less in geometry and more in how evidence is established.
The reader needs to understand what monitoring, metallography or NDT can actually prove.

Avoid it when

When not to use it.

A visual check or dashboard is being used to replace real release logic.
A blanket quality promise is expected with no part-specific context.
Acceptance criteria stay undefined even though the request is already concrete.

Decision table

What usually decides the route.

Decision table with decision point, good sign and escalation signal.
Decision point	Good sign	Escalate or avoid
Inspection target	Dimensions, bond quality, surface state or microstructure are clearly named.	Quality is only described as generally 'good'.
Method	NDT, cross-sections, measurement or documentation match the risk.	There is no link between risk and method.
Monitoring	Monitoring supports process understanding or review logic.	Monitoring is expected to replace release on its own.
Acceptance	Release criteria are defined before the work starts.	Acceptance is only discussed after the result exists.

Readable summary:

This route fits when Dimensions, bond quality, surface state or microstructure are clearly named.
Escalate when Quality is only described as generally 'good'.

Industrial example

Public proof with similar logic.

CS13 - 130 mm Bombenbohrer LMD Build-and-Coat Workflow: From Powder to Functional Drill

Exafuse publicly showed a 130 mm "Bombenbohrer" drill workflow in which Laser Metal Deposition (LMD) was used for both part fabrication and final surface coating.

Open related case study

Material and quality

What has to travel with the decision.

Material

The material route, substrate and heat effects define what inspection actually makes sense.
Microstructure or cross-section claims have to match the real application.

Quality

Set acceptance criteria, documentation and responsibilities before the work begins.
Read monitoring, NDT and destructive methods as complementary, not as substitutes.

Inspection and validation

Checklist before request or release.

Critical features and release criteria
Suitable measurement or NDT methods
Cross-sections or metallography where needed
Documentation format
Decision owner for deviations and release

This example shows the opposite end of the same process-selection logic.

The short answer

If the part is compact, new-build, channel-rich and geometry-driven, SLM / LPBF usually fits better than LMD because the value is in powder-bed detail rather than local material addition on a large or existing part.

Why SLM wins this screen

Internal channels and compact integrated detail are central to the part value.
The part is a new build rather than a repair or local modification.
The geometry would be difficult or inefficient to reproduce through local bead-by-bead buildup and later machining.
The commercial question is about fine function density, not large-scale local deposition.

Why LMD is weaker here

LMD is strongest when it adds value through repair, local buildup, cladding or larger near-net-shape geometry. It is usually weaker when the main requirement is fine internal-channel design across the full part.

What still needs review

The part still needs support-strategy review, powder-bed fit, post-processing planning, inspection scope and material-route confirmation. SLM being the stronger first screen does not remove those downstream questions.

What data should be sent

Send CAD, a note on the internal-channel purpose, target material, critical surfaces, tolerance expectations, quantity and any reason a hybrid route is still being considered.

Useful next pages

Use the LMD or SLM decider, A04: LMD vs SLM matrix, A18: hybrid manufacturing with LMD and CNC, Metal AM and the RFQ builder when a compact powder-bed candidate is being evaluated.

Buyer questions

Exact buyer questions that usually lead here.

What can monitoring actually prove?

Monitoring can make process behavior visible, but it does not replace a full release route without the right inspection behind it.

What inspection should be written into the request?

The method should follow from functional surfaces, risk, the material route and the internal release logic.

When is metallography worth it?

Especially when bond quality, microstructure or layer build-up are central to the technical decision.

What is the short difference between LMD and SLM?

LMD feeds material into a laser-created melt pool and deposits it where needed, often onto an existing part or a large free-form build area.

Recommended next steps

Tools, proof and related pages in one block.

Free tools

Compare LMD, SLM or hybrid Screen base cost drivers Find the right route

Related proof and guides

PageMetal AM: LMD & SLM Case studyCS13: 130 mm Bombenbohrer LMD Build-and-Coat Workflow: From Powder to Functional Drill Internal demonstratorCS08: 750 mm Multi-Material LMD Nozzle Demonstrator Case FAQFAQ06: LMD vs SLM FAQ: Choosing Between DED and PBF for Your Part ArticleA04: LMD vs SLM (PBF): A Practical Process-Selection Matrix for Industrial Metal Parts ArticleA18: Hybrid Manufacturing: Combining LMD and CNC Machining to Hit Tolerances on Large Parts

Recommended next steps

Move from article to decision.

Continue with the closest service page, proof example, FAQ or feasibility request.

Metal AM

Request a process-selection feasibility review

Send CAD, material, approximate size and target finish. Exafuse can review whether LMD, SLM or a hybrid route is the practical process path.

Start manufacturing RFQ

Free tools

Choose the next tool.

Use the relevant screen before sending data or requesting a call.

Decision toolCompare LMD, SLM or hybrid

Screens size, detail level, existing-part context, finishing and risk before a manufacturing request.

Cost screenScreen base cost drivers

Helps frame dimensions, material family, quantity and process assumptions early.

Free toolFind the right route

For cases where the problem is clear but the service, process or next step is still open.

Request packageBuild a request package

Creates a mail-ready draft with part, material, goal, deadline and file notes.

No account required. Nothing is sent to Exafuse unless you choose an email action yourself.

Structured fact block

Structured buyer summary for routing and retrieval.

EntityExafuse / ThinkIng - Additive Technology GmbH

TopicA46: Example: Why SLM Fits Compact Internal-Channel Geometry

Primary questionWhy does SLM fit better when compact internal channels or powder-bed geometry carry the part value?

Suitable whenThe page is being used to clarify inspection, documentation or release logic for LMD, repair or cladding. / The risk sits less in geometry and more in how evidence is established.

Not suitable whenA visual check or dashboard is being used to replace real release logic. / A blanket quality promise is expected with no part-specific context.

Required input dataCritical features and release criteria, Suitable measurement or NDT methods, Cross-sections or metallography where needed, Documentation format

Relevant service pageMetal AM: LMD & SLM

Relevant toolCompare LMD, SLM or hybrid, Screen base cost drivers, Find the right route

Relevant proof / case studyCS13: 130 mm Bombenbohrer LMD Build-and-Coat Workflow: From Powder to Functional Drill

Contact routeFeasibility request

Claim boundaryPublic technical orientation, not final engineering approval.

Author / review

Technical responsibility on this page.

Expert review

Manish Sharma

Research and development

Manish connects research and development topics with public technical explanations. His focus is LMD process understanding, monitoring, AI-assisted process control, image processing and practical tools that help buyers prepare better technical requests.

LMD process development
Monitoring and AI
Technical tools and content

Process, material and release-relevant statements are handled conservatively at Exafuse and remain tied to the specific part context.

Final CTA

Move from reading to technical review.

Start with the key project facts: goal, part, material, damage or protection zone, finishing, inspection and timing.

Open feasibility route Start RFQ builder