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I followed up with Prusa on this recently (a few months later) and they confirmed that there were issues with some belts but that this has been fixed in production. To provide a better guarantee of quality, I opted to replace both the X and Y axis with genuine GATES 2GT PowerGrip GT3 belts. This has fixed the problem for me.


Mine came from the factory tight enough that it doesn't sag at all, but not so tight that it feels hard or stiff or difficult to deflect a bit with gentle pressure. With the bed pushed all the way to the back, I can push the y-axis belt to the side about 1/8" with gentle pressure, and it feels like that's about as far as it's going to go even if I were ...


Generally, a timing belt is a complicated device and many things depend on its internal construction and materials (it may be damaged when bound in wrong direction, or when cut, and when overtighten of course, etc.). There is also physics and math applicable, based on Mersenne's laws. Some vendors provide calculators (online or as phone apps), which can ...


To be sure you could measure the width and the tooth spacing (pitch). The most probable and used belt in 3D printers is the GT2 6 mm belt. The teeth are spaced 2 mm and the width is 6 mm.

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