Uploaded November 2025 | Updated September 2026, 2 weeks ago

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3D printing your own core filament sounds like a fun DIY experiment — but does it actually improve layer adhesion?
In this video, I simulate a core filament by combining two materials with extremely different layer-adhesion properties: BambuLab Tough PLA on the outside (strong skin) and BambuLab Silk PLA in the core (weak layer adhesion). I already tested real core filaments before, but I needed a controlled reference to understand how much the internal core structure actually affects layer adhesion.

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🔗 Mentioned in the video:
Spiral, core filament STL: printables.com/model/1496666-core-filament-for-3d-printing
Core filaments explained: youtube.com/watch?v=dxMQN37j2JE

⏱️ Chapters

0:00 Introduction
0:25 The Theory
1:54 The 3D model
4:44 3D printing
7:55 Benchy, closer look
9:21 Layer adhesion test
9:50 Hook test
10:39 Conclusions

🏷️ #3Dprinting #filament #layeradhesion #mytechfun #strengthtest #3dprintfilament #PLA #3dprinter