100% Printable Adjustable Belt Tensioner

I needed a replacement belt tensioner but found none that where completely printable, they all required other hardware. However, using the technique in this original part I was able to. The belt folds over itself and into its own teeth, so you can feed both sides of a cut belt in and just pull it to whatever tightness you need, slotting it in to the available tooth. The print is super simple too, without a real tensioner you can see the quality due to the slack, but it still printed very usable.