A fully 3D-printed turbine fan with an integrated triple planetary gear impressively demonstrates the possibilities of modern FDM printing technology. The Maker Tomek shows that even complex mechanical assemblies can now be reliably implemented as printable assemblies – without any additional screws or bearings. Simple post-processing steps are all that is needed to assemble the device in a functional manner.
All components, including gear wheels, axles and fastening elements, come directly from the 3D printer. This makes it easy to make adjustments: If you prefer the crank on the opposite side, mirror the components. If you need more airflow, scale the model up accordingly. As all connecting elements are also printed, there are no problems with unsuitable standard accessories when scaling up.
However, the implementation as a “print-in-place” model, i.e. with directly printable moving parts, does have certain requirements. For clean movement, it is advisable to set the seam position to “random” in the slicer settings. This ensures that there are no interfering edges that hinder the sliding of the gears. In addition, a suitable lubricant – such as PTFE-containing lubricant or, in emergencies, candle wax – ensures improved running properties.
One disadvantage of the project is that operation is relatively loud. Due to their surface texture, printed gears generate significantly more noise than industrially manufactured versions. Nevertheless, the model shows how far functional 3D printing has come. The maker makes the 3D model available free of charge on Printables.
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