YoIs your Bambu Lab nozzle hitting infill during a print? It is a frightening sound—a loud scraping or “thudding” noise that makes you worry your printer is broken.
You have just started a long print on your X1C, P1S, or A1. The first few layers look perfect. But an hour later, you hear the nozzle dragging across the plastic. In worst-case scenarios, this friction knocks the model completely off the build plate.
The good news is that your hardware is fine. The problem is usually the default slicer setting. In this guide, we will explain why Bambu Lab nozzle hitting infill happens and how to fix it instantly.
Why is the Bambu Lab Nozzle Hitting Infill?
To understand the solution, you must understand why the collision occurs. By default, Bambu Studio sets the infill pattern to “Grid.”
Grid infill prints lines in two directions on the same layer. Where these lines cross, plastic is laid over plastic, creating a tiny “bump” or high spot. On slower printers, the nozzle melts through these bumps. However, because Bambu Lab printers move at incredible speeds, the nozzle doesn’t melt the bump; it crashes into it.
This is the primary cause of a Bambu Lab nozzle hitting infill. The cumulative effect of hitting thousands of these bumps creates noise and can ruin your print quality.
The Solution: Switch to Gyroid Infill
If you want to stop the scraping, you must stop using Grid. The best alternative is the Gyroid pattern.
Gyroid is a 3D structure based on sine waves. Unlike Grid, the lines in a Gyroid pattern never cross each other on the same layer. The nozzle always travels through empty space or lays down fresh plastic on a flat surface.
How to Fix It in Bambu Studio
Changing this setting takes seconds:
- Open Bambu Studio.
- Go to the “Strength” tab.
- Change “Sparse infill pattern” from “Grid” to “Gyroid”.
Conclusion
If you hear a scraping sound, it is almost certainly a case of the nozzle hitting infill due to the Grid pattern.
By switching to Gyroid (or the new Cross Hatch pattern), you eliminate the risk of collisions, reduce noise, and get stronger parts. Make this switch your default setting for a smoother printing experience.
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