Prusa i3 Add-On X Tensioner

Why print a whole new idler when all you really need is a tensioner to fit your existing idler? This concise add-on x-axis belt tensioner can be used with most existing Prusa i3 X-idlers and requires very little material. If you have an unusual X-idler or another printer with a similar design, you can modify the included SCAD file to fit.

See it in action at http://youtu.be/P8eE1t2wybg

Print instructions

Bill of Materials

• 1x M3x20 bolt
• 1x M3 nut
• 1x M3 washer
• 1x M4x14 bolt
• 1x M4 nut
• 1x 624 ball bearing

Assembly

To build this part, slice and print one of the included STL files and add the vitamins listed in the BoM. (One of the STLs prints the tensioner part on its side with built-in supports. While it requires some extra cleanup it should make a stronger and neater looking part.) Then just stick the endcap part over the hole in the x-idler and screw it into the trapped nut in the tensioner. Couldn't be simpler!

(Note that the x-idler.stl file is only included for the "assembly" view in the SCAD file.)