Prusa i3 belt tensioner (and other printers should work)
thingiverse
Note: All these types of clip-on belt tensioning systems are a temporary fix! They will all cause vibrations in the belt, which will feed back into the print. A proper stationary tensioning system is needed for quality prints. • Version 2 uploaded today, July 13, 2016 - lighter and slightly shorter. Tested at high speed with small movements of the printer; the belt vibrated, and the tensioner knocked into the carriage belt holder, but it didn't cause any damage - just an annoying noise. I took inspiration from this design, which added too much tension on the belt, so I created a lower-tension version. It's available at http://www.thingiverse.com/thing:81991. This tensioning system provides a slightly lighter belt tension than most. I was either over- or under-tightening the belt during installation, trying to get it just right. The previous design yanked on the entire system; this one offers a more subtle, adjustable tension. (PS: Don't forget to vacuum around your printer - it's essential!)
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