Hi everyone,
we’re currently facing a recurring issue when printing with our Bambu X1 Carbon, which appears specifically when using PAHT CF15 from Material4Print.
We’re printing rings made from this material for one of our products.
The outer surface of the parts is perfect – dimensional accuracy, surface finish, and layer consistency are excellent.
However, on the inner surface, we repeatedly see small defects or irregularities, which I’ll show in the attached photos.
The defects mostly occur at the point where the thin wall transitions into the centering elements.
These centering elements are significantly thicker and solid-filled.
That said, while this is the most common area affected, the issue sometimes also appears randomly at other spots – but always exclusively on the inner side (!!) of the rings.
I’m already in contact with Material4Print support and working through some troubleshooting steps, but so far, we haven’t managed to achieve a completely flawless print series.
We’re printing the ring in three different wall thicknesses, and this issue only occurs on the thinnest version – the other two print perfectly fine.
On average, we’re currently getting 1–3 defective rings out of 8 on one build plate.
Since I’m generally very happy with the material (high temperature resistance, excellent stiffness – exactly the properties we need), I’d like to ask the community for additional insights or experiences.
I’m attaching several photos of the rings (especially the inner sides showing the defects).
Maybe someone can spot what might be causing this – whether it’s related to print parameters, cooling, Z-hops, inner wall speeds, or perhaps an issue with filament quality or moisture.
For context: in the AMS we’re using, humidity is currently at 16%, and the spools were dried at 100 °C for about 10 hours, as recommended by the manufacturer.
I’d really appreciate any suggestions or shared experiences!
Best regards,
Nico Wiedemann
