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Checking and Adjusting Belt Tension

Correct tension on the X and Y-axis belts is fundamental to the accuracy and quality of your prints. Loose belts can cause "layer shifting" and distorted shapes, like circles that look like ovals.

How to Check Tension

There are several methods to check if your belts are properly tensioned:

  1. Print Test: The easiest way is to print a simple round object, like a cylinder. If the result is a perfect circle, your belts are likely fine. If it comes out as an oval or irregular shape, one or both belts may be loose.
  2. The "Twang" Test: A properly tensioned belt should feel taut and make a low-pitched "twang" sound when plucked, like a bass guitar string. It should not be overly tight (which strains the motors and bearings) nor too loose.
  3. Printer Diagnostics (if applicable): !!! note "Firmware Diagnostics" Some printers have a diagnostic function in the menu that provides a numerical value for belt tension. If your printer has this feature, check the ideal value range recommended by the manufacturer.

Belt Locations

  • Y-Axis Belt: Located underneath the print bed (heatbed).
  • X-Axis Belt: The belt that moves the extruder assembly from left to right.

If you find a belt is loose, consult your printer's assembly manual on how to tighten it correctly. Typically, there is a tensioner screw or bracket that allows for adjustment.