How to Fix X/Y Belt Tension Issues (Loose or Over-tight)
Step-by-step fix for x/y belt tension issues (loose or over-tight) on Bambu Lab printers including X1C, H2D, P1S, and A1.
How do I fix x/y belt tension issues (loose or over-tight)?
- 1
Pluck the belt like a guitar string — it should give a low-pitch twang, not be floppy or guitar-tight. Adjust the tensioner screw on the end of each axis.
- 2
Check belt teeth for wear or missing teeth. A worn belt slips under high acceleration, causing random layer offsets.
- 3
After tensioning, run a ringing/ghosting test print. If artifacts appear, enable input shaper in Klipper (ADXL345 accelerometer recommended for tuning).
Pro tip: Belt tension directly affects print quality. Too loose causes ghosting, too tight causes motor strain and missed steps.
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