Based on 4 reviews
Belt Tuner is a free online tool that measures 3D printer belt tension using microphone-based pitch detection. It provides target tension frequencies in hertz for models like Bambu, Prusa, Ender, Creality, Voron, and Markforged machines. The site also includes a self-test tone generator and links to replacement parts such as GT2 timing belts and pulleys.
The tool uses your device's microphone and the Web Audio API to detect the pitch of a plucked belt. It applies an autocorrelation algorithm to find the fundamental frequency, filtering out background noise and overtones to give a highly accurate reading without requiring an expensive physical tension gauge.
You can verify the pitch detection algorithm independently of a printer using the self-test tone generator feature. This tool generates a test tone at 80 Hz to ensure the app is functioning correctly before measuring a real belt.
The website offers links to standard replacement parts including GT2 6mm timing belts, belt tensioner upgrades, and GT2 20T pulleys for users who need new components.
Over-tightening a belt can cause the stepper motor to work harder, leading to overheating and premature wear on the motor bearings. It can also stretch the belt over time, ruining its pitch and introducing fine vertical artifacts into prints.
If a belt is too loose, you will experience layer shifting, dimensional inaccuracies, and backlash because the belt slack prevents the toolhead from moving the exact required distance when the motor turns.
The frequency of a vibrating string or belt is directly related to its tension, length, and linear density, governed by the wave equation f = (1 / 2L) * √(T / μ). For a specific printer model, the belt length and type are constant, meaning tension is solely determined by the frequency.
Some users on Reddit ask about specific target frequencies for the Prusa CORE One L, noting that this information is absent from both the support site and the belt tuner web app.
The website warns that over-tightening can stretch the belt and ruin its pitch, while under-tightening leads to the specific issues mentioned above, emphasizing the need to find the exact middle ground.
The tool is designed for 3D printer enthusiasts who want to accurately tension their timing belts without guessing or using subjective methods like the 'guitar string' test.
The website states that the age-old advice of tightening until it twangs like a guitar string is highly subjective and often leads to over-tightening.
The tool allows users to select from a range of printer models including the Voron Trident A and B belts, as well as the Markforged Metal X front and rear belts.
On Trustburn, Belt Tuner has a rating of 4.3 out of 5 based on 4 reviews.
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The app is convenient for quick checks, and the local processing is a good privacy feature. However, the reliance on community targets means accuracy varies. I wish there were more official manufacturer data included to ensure consistent results across different printer models.
Finally, a free tool that actually works without installing anything. The mic detection is surprisingly accurate for my Ender 3 X axis. Love that it processes everything locally in the browser.
The use of the Web Audio API to detect pitch via microphone is an innovative approach that eliminates the need for physical gauges. The autocorrelation algorithm effectively filters background noise to provide accurate Hertz readings. However, the reliability of the results depends entirely on the accuracy of the community-submitted targets, which may vary between different firmware versions or belt lengths for the same printer model.
It is nice that Belt Tuner is free and runs locally in the browser without requiring expensive hardware. However, the selection of supported printer models could be broader, and the frequency targets rely heavily on community contributions rather than strict official manufacturer data for every axis.
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Belt Tuner is a free online tool designed to measure 3D printer belt tension using microphone-based pitch detection. It provides target tension frequencies in hertz for a range of 3D printer models, including Bambu, Prusa, Ender, Creality, Voron, and Markforged machines. The site also includes a self-test tone generator for verifying the pitch detection algorithm independently of a printer. In addition to the core tool, it offers links to replacement parts such as GT2 timing belts, pulleys, and belt tensioners, and answers frequently asked questions about properly tensioning 3D printer belts.