A Practical RFQ Checklist for Pure Copper and CuCrZr LPBF Parts

Walter Chen — Fri, 17 Jul 2026 02:10:05 +0000

Copper LPBF projects move faster when the RFQ is treated as an engineering data package instead of a short request for a price. This checklist is intended for hardware teams, thermal engineers, product developers, and sourcing teams preparing a pure-copper or CuCrZr part for additive manufacturing.

1. Confirm why additive manufacturing is being used

Start with the feature that creates value:

internal cooling channels that cannot be drilled;
compact heat exchangers or cold plates;
integrated manifolds that reduce joints;
induction coils with controlled flow paths;
RF, vacuum, semiconductor, or power-electronics hardware;
low-volume parts where tooling would dominate cost.

If the part is a simple block, tube, or plate, conventional machining, extrusion, brazing, or a hybrid route may be more economical. LPBF is strongest when geometry, integration, or iteration speed matters.

2. Select the copper alloy around the operating requirement

Pure copper is usually the starting point when electrical or thermal conductivity dominates and the component is not heavily loaded.

CuCrZr is often preferable when the part also needs strength, fatigue resistance, dimensional stability, or repeated thermal-cycle performance. It gives up some conductivity in exchange for a more balanced mechanical profile.

Do not specify the alloy name alone. Include the property that drives the choice: thermal conductivity, electrical conductivity, proof strength, hardness, maximum temperature, pressure, or cycle life. If a post-heat-treatment value is required, say so explicitly.

3. Mark the geometry that controls feasibility

A supplier should be able to identify these features directly from the model and drawing:

minimum wall and fin thickness;
channel diameter or hydraulic dimension;
unsupported spans and overhangs;
sealing surfaces;
threads, bores, datums, and mating interfaces;
areas that may receive support material;
machining stock;
internal surfaces that must be cleaned or inspected.

For channels, provide inlet and outlet sizes, required flow direction, pressure, media, cleanliness, and the acceptance method. A hidden passage is not just a geometric feature; it is also an inspection and post-processing problem.

4. Define the finishing route before quoting

Copper AM parts often need several linked operations:

LPBF build and support removal;
stress relief or alloy-specific heat treatment;
CNC machining of interfaces;
surface finishing or cleaning;
dimensional, pressure, leak, conductivity, or material inspection.

The sequence affects datums, distortion risk, machining allowance, and final delivery time. State which surfaces may remain as-built and which require a numerical roughness, flatness, or tolerance.

5. Turn the RFQ into structured data

A compact machine-readable summary helps internal teams and suppliers check completeness. For example:

part:
  name: liquid-cooled copper manifold
  alloy_preference: pure copper
  quantity: 6
  revision: C

operation:
  media: deionized water
  max_temperature_c: 80
  max_pressure_bar: 6
  leak_test_required: true

critical_features:
  min_wall_mm: 1.2
  smallest_channel_mm: 3.0
  machined_interfaces:
    - inlet face
    - outlet face
    - mounting datum A

inspection:
  dimensional_report: true
  pressure_test: true
  conductivity_report: requested
  material_certificate: requested

 delivery:
  destination_country: Germany
  target_date: 2026-09-15

The values above are only an example; the useful practice is to make assumptions visible. A drawing and 3D model remain essential.

6. Ask questions that expose risk early

Before accepting a quote, ask:

Which features drive build orientation?
Where will supports be attached?
How will internal powder and debris be removed?
Which surfaces need machining stock?
What heat treatment is planned?
How will channels be inspected or tested?
Which requirements are included in the quoted price?
Which assumptions could change lead time?

A good engineering review may recommend a geometry change, an alternate alloy, or a hybrid process. That is useful information, not a failure of the model.

A concise RFQ package

The minimum practical package is:

STEP or another manufacturing-ready 3D model;
dimensioned drawing with datums and critical tolerances;
alloy and property requirements;
quantity and revision;
operating temperature, pressure, media, and duty cycle;
post-processing and finish requirements;
inspection and documentation requirements;
delivery location and target date.

COPPER 3DP coordinates pure copper and CuCrZr LPBF production with heat treatment, CNC machining, finishing, inspection, and export support for industrial parts.

A longer design and RFQ guide is available here: Designing Pure Copper and CuCrZr Parts for Metal Additive Manufacturing.

The goal is not to make an RFQ longer. It is to make the decision-critical information explicit before build planning begins.

DEV Community: Walter Chen