Skip to content

Belt Tension Adjustment

Proper belt tension is essential for maintaining print quality and ensuring the longevity of your MY-Mini 3D Printer. This guide provides step-by-step instructions to check and adjust the tension of the X-axis and Y-axis belts.

Tools Required

  • 2.5 mm Allen key (or the size included with your printer)
  • Belt tension gauge (optional, for precise measurement)
  • Flashlight (optional, for better visibility)

When to Adjust the Belts?

You should check and adjust the belt tension in the following cases: - After assembling the printer. - If you notice print artifacts such as ghosting, layer shifts, or inconsistent dimensions. - During regular preventive maintenance (every 3-6 months).

Step-by-Step Procedure

1. Prepare the Printer

  1. Turn off the printer and unplug it from the power source.
  2. Ensure the print bed and extruder are free of obstructions.
  3. Move the print head and bed manually to the center of their respective axes for easier access.

2. Check the Belt Tension

X-Axis Belt:

  1. Locate the X-axis belt.
  2. Gently press the belt with your finger. It should feel firm but not overly tight. A good rule of thumb is that it should produce a low bass note when plucked.
  3. If you have a belt tension gauge, measure the tension. The ideal tension is often specified by the manufacturer, but a common range for printers like the Prusa Mini is around 240-300 Hz.

Y-Axis Belt:

  1. Locate the Y-axis belt underneath the print bed.
  2. Gently press the belt with your finger. It should feel similar to the X-axis belt.
  3. Use a belt tension gauge if available. The ideal tension is the same as the X-axis.

3. Adjust the Belt Tension

X-Axis Belt:

  1. Locate the tensioning screw on the X-axis.
  2. Use the appropriate Allen key to adjust the tension:
  3. Turn clockwise to tighten the belt.
  4. Turn counterclockwise to loosen the belt.
  5. Make small adjustments and check the tension frequently.

Y-Axis Belt:

  1. Locate the tensioning screw for the Y-axis belt.
  2. Use the appropriate Allen key to adjust the tension:
  3. Turn clockwise to tighten the belt.
  4. Turn counterclockwise to loosen the belt.
  5. Check the tension again after each adjustment.

4. Test the Printer

  1. Power on the printer and run a test print.
  2. Observe the print quality:
  3. If you notice ghosting or layer shifts, the belts may still be too loose.
  4. If the printer makes unusual noises or the motors struggle, the belts may be too tight.
  5. Repeat the adjustment process if necessary.

Tips for Optimal Belt Tension

  • Avoid overtightening the belts, as this can cause excessive wear on the motors and pulleys and can even damage the printer's frame.
  • Ensure the belts are parallel to the axis and not rubbing against any components.
  • Regularly inspect the belts for signs of wear, such as fraying or cracks, and replace them if necessary.

Belt Tension Adjustment Belt Tension Adjustment

Illustration of belt tension adjustment points.

By following these steps, you can ensure that your MY-Mini 3D Printer operates smoothly and produces high-quality prints.