Prusa mk3 belt tensioner gauge
thingiverse
Unless you have a back ground in some sort of mechanical work it's hard for some to really know what to expect when it comes to what the "right" tension on a belt should feel like. This should help you get the belt tension on a mk3 and mk3s somewhere between the 240-300 that's recommended. Heres the how to video. https://rumble.com/vf89et-3d-printer-belt-tensioning-tool.html
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