Move the Y carriage to the middle of the Y axis.

Pluck the lower portion of the belt to make a sound. Don't pluck it too hard as it might touch the y_belt_holder and distort the sound.

Adjust the belt tension until you have a frequency close to 90Hz (for a standard 6mm belt). Between each adjustment, move the heatbed back and forth along the whole length of the Y axis and then centre it again.

It is very important to move the heatbed between each measurement, this ensures that the belt is evenly tensioned.

If you are using our optional part for a 9mm belt, you then need to adjust the frequency to 80Hz.

If your belt is new, you can repeat this procedure after a few prints. A new belt will loosen in the first several hours of use.