Belt Tensioner - Idle Pulley for Prusa Mendel I2
thingiverse
Use two 608 bearings, and a short length of an 8mm smooth rod. Also you will need two M6 bolts & nuts as well as two 4-32 screws & nuts. Installation is easy and does not require any disassembling of the threaded rod frame. Tighten the belt to desired tension and then carefully tighten at the preferred angle with the existing nuts/washers on the threaded rod frame. I left my old 608 bearing idler on the frame's threaded rod. it is acting as a washer on one side between the nut and the tensioner ;) Instructions Printed with support for smaller piece. The larger part is fine w/o support. Both pieces printed great @ .2mm layer height.
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