Fillets Over 90 Degrees: Experts Slap Overhangs, Blaming Anisotropy for Failed Prints
Structural failure in FDM printing hinges on layer weakness, or anisotropy. Simply printing thin, tall, or cantilevered parts is shown to fail repeatedly.
The debate over print failure centers on blame: Is the fault the design, or the machine? Specific suspects range from nozzle clogs and moisture (MissJinx) to Z-axis calibration hiccups (HelloRoot). Strong suggestions include avoiding sharp 90-degree joints in favor of fillets (Wfh), or splitting complex models into flat components (pro_user). The high-scoring advice pushes designing parts to angle the load, like at 45 degrees (captain_aggravated).
Consensus points to structural revision. Users suggest reinforcing connections with fillets and ensuring parts are inherently angled, not just relying on supports. However, the fault lines remain deep, splitting between blaming the CAD model vs. blaming extruder mechanics or moisture.
Key Points
Sharp 90-degree connections weaken parts significantly.
Wfh argues connections must use fillets to boost structural integrity.
The best way to print complex parts is to break them apart.
pro_user advises separating models (e.g., printing base/legs separately) to print flat.
Printing overhangs at a 45-degree angle is the most reliable workaround.
captain_aggravated claims this angle successfully demonstrates load distribution.
Filament moisture is a prime suspect for unexplained anomalies.
MissJinx urges verification and drying of filament as the first troubleshooting step.
A failure occurring at the same Z-level suggests a physical axis error.
HelloRoot suggests a systemic issue, possibly physical scraping, at the repeated Z-coordinate.
Source Discussions (3)
This report was synthesized from the following Lemmy discussions, ranked by community score.