Calculation: How much does a 3D printed part really cost?

1. Introduction: The truth about unit costs

The question “How much does this component cost in 3D printing?” is often answered incorrectly. Many buyers take the weight of the CAD model and multiply it by the price per kilo of metal powder. This calculation is fatal.

The Cost-per-Part (CPP) in laser-based powder bed printing (PBF) is a complex equation in which the raw material often makes up the smallest proportion. This white paper breaks down the true cost drivers of additive manufacturing.

2. The machine hour rate (depreciation)

Industrial metal 3D printers cost between 400,000 and 2 million euros.

• Depreciation: These machines usually have to amortize themselves over 5 years. Longer terms reduce the hourly rate. A machine that runs in 3 shifts (24/7) is significantly more economical than one that only prints during the day.
• Maintenance & wear: Filter changes, replacing expensive coater lips (recoater blades) and regular calibration of the optics (galvo scanner) cause high fixed costs.
• Result: A typical machine hourly rate for a multi-laser system is often between 80 and 150 euros. With a printing time of 40 hours for a component, this is the absolutely dominant cost factor (€3,200 - €6,000).

3. Material costs: More than just the component weight

The price of metal powder (e.g. titanium grade 5 for 150 €/kg or stainless steel for 50 €/kg) is only half the story.

• Support structures: Supports are printed to fix the component to the plate and dissipate heat. These consist of the same expensive powder and end up in the trash as scrap after printing. For poorly designed components, supports can account for 30% of the total weight.
• Powder degradation: The unmelted powder in the build space is recycled. But: Every time the powder is sieved, the particle size distribution changes minimally and it absorbs oxygen (especially with titanium). After 10 to 20 cycles, the “old” powder often has to be refreshed proportionately with fresh (“virgin”) powder (refresh rate). This loss must be taken into account.

4. Operating materials: argon and electricity

A laser with 1,000 watts of power requires many times more electricity from the socket (cooling (chiller), control technology, circulation pumps).

• Protective gas: The printer constantly flushes the chamber with argon to keep the oxygen value below 0.1%. A large machine consumes many liters of high-purity argon per minute. For a 5-day print job, this adds up to hundreds of euros.

5. The Hidden Monster: Post-Processing

The component is printed. Now the manual (or expensive automated) operations begin:

1. Depowdering: Often takes several hours of manual work.
2. Heat treatment (stress relieving): The external vacuum oven also costs machine hours and energy.
3. Separation: Wire erosion (EDM) of the component from the expensive construction platform. (The construction platform itself then has to be milled flat again - another cost factor!).
4. CNC post-processing: Functional surfaces must be re-milled on a separate 5-axis machine. This machine has its own high hourly rate.

6. Non-destructive testing (QA)

If the industry (aerospace/medicine) requires a CT scan for every component, this scan in a testing laboratory often costs 200 to 500 euros per component. This can double the price of a small component.

7. Conclusion: Save the ROI through packing and DfAM

How do you make 3D printing economical? Through nesting/packing (stuffing the build platform with as many components as possible, even stacked on top of each other in the Z axis if the process allows it), the fixed costs per construction job (setup time, purging gas) are spread over many more components.

In addition, Design for Additive Manufacturing (DfAM) is mandatory. Every gram of volume that is eliminated through topology optimization directly saves machine time and material - and exponentially reduces the cost-per-part.