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METAL X PRINTER USER GUIDE
ADJUSTING BELT TENSION
Supplies
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3mm hex key
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Tuning device or mobile device equipped with tuning app (see below)
The print head on your printer is moved using a system of motors, pulleys, and belts. For optimal operation, it
is important that belt tension is maintained at the correct level. High belt tension will contribute to premature
bearing wear; low belt tension can lead to reduced printing accuracy and/or dislocation.
Belt tension is adjusted at the factory using a calibrated meter to measure the audio frequency of the belt when
it is plucked, as there is a direct relationship between belt tension and frequency.
Since belts may stretch over time, it is recommended that users occasionally (every 100 prints) measure
belt tension and adjust as necessary. This can be done with any device that allows you to measure audible
frequencies in hertz (Hz). One inexpensive option is to use a smartphone equipped with the free version of either
the Fine Tuner app (for iOS) or the Fine Chromatic Tuner app (for Android). These applications are designed to
tune musical instruments, but they can also be used as accurate frequency meters. (
The following instructions refer to using a phone app to tune the belt. If you are using a dedicated tuner device,
follow proper procedures for its operation.
Note: To ensure accurate measurements, always take frequency adjustments in quiet surroundings.
1.
Install and open a tuner app on your mobile device.
2.
Power off the printer.
3.
Manually move the print head to a position that allows space for plucking the belt underneath the Y-rail
opposite the print head.