How do I measure belt frequency?

Pluck the belt like a guitar string and use a frequency analyser app on your phone (many free ones available). Pluck the longest span between pulleys and note the dominant frequency. Repeat several times for accuracy.

What tension should GT2 belts be at?

GT2 belts on 3D printers should be tensioned to 2-4 Newtons. Too loose causes backlash and ringing artifacts. Too tight causes excessive bearing wear and motor strain. The frequency method gives a precise measurement.

How often should I check belt tension?

Check belt tension every 200-500 print hours or if you notice ringing artifacts, layer shifting, or unusual sounds. New belts may stretch and need re-tensioning after the first 50-100 hours.

Can belts be too tight?

Yes. Over-tightened belts cause excessive load on stepper motors and bearings, leading to premature wear, increased noise, and potential motor overheating. They can also deform printed belt paths in cheaper printers.

3DPrintCalcs

Belt Tension Calculator — GT2 Belt Frequency & Tension

Calculate correct belt tension frequency for GT2 and other timing belts.

Belt Span Length

Distance between pulleys

Belt Type

Measured Frequency

From phone app (0 = skip)

Belt Mass

Override if custom belt

How We Calculate This

Belt Tension Formula

Frequency = (1 / 2L) x sqrt(T / mu)
Tension from frequency = mu x (2Lf)^2

Where L = span length (m), T = tension (N), mu = belt mass per metre (kg/m), f = frequency (Hz). This is the fundamental vibration frequency of a tensioned string. By measuring the frequency of a plucked belt, you can calculate its tension precisely.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.