Printing Better-Fitting Dust Gaskets with a Single Foamed Extrusion
25 Aug 2026We cut the print time for a batch of 14 wall-charger gaskets from approximately 60 minutes to 15 minutes, while also making the printing process more stable and installation easier.
These gaskets have a simple job: keeping dust out of a static enclosure interface. Our first solution used gasket cord from a reel, but cutting and installing every length took too much time. Custom-manufactured gaskets were too expensive, so we moved to 3D-printed TPU.
Printing made the parts inexpensive and quick to install, but conventional slicing introduced seams, travel moves and retractions. The resulting blobs, strings and local discontinuities made the process unreliable and could interfere with the fit in the enclosure groove.
The breakthrough came from FiberFlex Aero by @Fiberlogy. Its heat-activated foaming allowed a nominal 0.40 mm extrusion to expand into the broad, compressible bead we needed. That made it possible to print each gasket as one continuous, five-turn helical extrusion, something the non-foaming TPU could not achieve with our 0.4 mm nozzle.
Instead of relying on conventional slicing, we extracted the gasket centreline and used FullControl to generate the toolpath explicitly. The nozzle remains in continuous motion throughout each gasket, eliminating internal travel moves, retractions and stop-start seams.
The result:
- 14 gaskets in approximately 15 minutes instead of 60
- A continuous toolpath with fewer defect opportunities
- A foam-textured bead that is easier to compress into the groove
- Faster, more forgiving installation
This was a focused side exploration at @Patient Lifting Solutions. I developed the concepts, test strategy and physical experiments, while ChatGPT Codex helped implement the Python tooling, adapt the Bambu Studio .gcode.3mf workflow, and prepare the analysis and whitepaper. I remained the human in the loop for testing, interpretation and final engineering decisions.
Thanks to @Fiberlogy for drawing our attention to FiberFlex Aero and for developing the material that made this process route possible.
The full method, settings, scanner-based extrusion-width study and limitations are documented in the whitepaper, Printing Better-Fitting Dust Gaskets with a Single Foamed Extrusion.
Read or download the full whitepaper (PDF, 5.2 MB)
Topics: Additive manufacturing, 3D printing, TPU, DfAM, manufacturing engineering, process development, and human-in-the-loop engineering.