One strong point of 3D printing is that it enables producing parts with hollow structures such as internal channels in a single production step.
However, you will need to to look out for 2 factors when 3D printing a piece with internal channels:
- The technology used for printing
- The complexity of your geometry.
Our online ordering system detects internal channels as well as details that are smaller than our recommended values and generates a warning message. Please evaluate the feasibility of your part (see more information below) and check the box to accept risks in order to continue. In case of doubt, request a manual quote or reach out to your local Sales team.
1. Technology used for printing
We offer a multitude of technologies which allow for 3D printing of models with internal channels. You can choose from: Metal 3D printing, Laser sintering, Multi Jet Fusion, Stereolithography and Fused Deposition Modeling. There are technologies which are not suitable for printing parts with internal channels in the technologies, such as: Metal binder jetting, Lost wax casting and PolyJet.
Please keep in mind that in all of the named technologies either powder or support structures need to be removed after building. This is where the next point: geometry, also plays a key role, see below.
Please note that in some cases, choosing an optimal orientation can help avoid printing support structures. If you need assistance, please send a quote request to our Sales teams.
2. Complexity of the geometry
The geometry or design of the inner channels will of course greatly influence the result of the 3D printed piece.
More optimal results will be achieved:
- the shorter
- the wider and
- the straighter / straightforward the channels are.
This will not only enhance printing quality but especially enable easier removal of powder or support structures. We recommend diameters of 2 mm for internal channels to enable powder removal.