Three business cases, three lessons: when does 3D printing really make production greener?
Additive manufacturing (AM) is often described as the greener way to make things. But is it always? In the ADDCIRCLES project, researchers from Slovenia and Austria tested this with three companies from the cross-border region. They compared 3D-printed solutions with conventional manufacturing – technically, economically and in terms of environmental impact across the whole life cycle. The answers turned out to be more interesting than a simple yes.
A camera housing for a vineyard robot
Robokraft is developing an autonomous robot for vineyards, and its cameras need to stay clean in dusty, wet conditions. Using selective laser sintering (SLS), the team designed a single PA11 part that replaces a multi-part camera assembly. The one housing combines an internal air channel that keeps the lenses clear, a watertight shell, drainage and mounts. A geometry like this cannot be made with conventional methods. The airflow was checked with CFD simulation before printing.
The life cycle assessment brought a clear lesson: the main environmental hotspot is the PA11 powder itself, so how the printer is used matters enormously. In the reference case, the build chamber is only about 13% full and only fresh powder is used. Filling the chamber more densely and reusing recycled powder cut the environmental impact to between 4% and 18% of that reference. Printing energy per housing fell from 3.54 kWh to as little as 0.56 kWh.
A bicycle bottle cage from fibre-reinforced filament
Berk Composites currently makes its carbon bottle cages by resin infusion. Together with the partners, the company tested two printing routes:
- Short-fibre filament printing (FFF) produced functional prototypes with a relatively simple workflow. The main challenges were slicing, part orientation and support removal.
- Continuous-fibre robotic printing proved feasible and a demonstrator was built. It needed much more development work, on design for AM, robot reach, toolpath generation and integration of the robot with the extruder.
Our LCA found that the modelled PLA-based 3D-printed bottle cage had lower potential impacts in 16 of 18 environmental categories than conventional resin-infusion production. For climate change, the impact of the conventional route was around 5.2 times higher. But carbon-fibre-reinforced PETG-CF showed a more mixed result, demonstrating why material selection matters.
Printed mould inserts with conformal cooling
In the third case, we compared an injection moulding tool with additively manufactured inserts, whose cooling channels follow the shape of the part, against a conventional tool. The result is a lesson in honesty about AM. For small production series, the printed insert is less efficient, because making it carries a higher environmental cost up front. The conformal channels shorten cooling times only slightly, but those small energy savings add up with every cycle. In this case, the break-even point came at about 39,000 injection moulding cycles. Beyond that, the AM tool comes out ahead.
What do the three cases tell SMEs?
- AM brings the biggest gains where it does something conventional manufacturing cannot, such as combining many functions in one part.
- How you print matters as much as what you print: machine utilisation and powder recycling can cut impacts many times over.
- Some benefits only appear over time. For tooling, production volume decides whether AM pays off environmentally.
The full business case reports will be uploaded soon. Are you considering AM for your own products? Find partners and equipment on our interactive map or contact us at zala.lorber@ftpo.eu.