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Prusa i3 Add-On X Tensioner

by thinkyhead, published

Prusa i3 Add-On X Tensioner by thinkyhead Nov 20, 2014
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Summary

[2014-11-24] Improved supports, increased hole slop, added more standard options.

There are a lot of X idlers with a tensioner mod for the Prusa i3. But why print an entirely new idler when all you really need is a tensioner that fits your existing one? This simple, 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.

http://youtu.be/P8eE1t2wybg

Instructions

Bill of Materials

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

There are a lot of X idlers with a tensioner mod for the Prusa i3. But why print an entirely new idler when all you really need is a tensioner that fits your existing one? This simple, 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.

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.)

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what i would do is print as x-ten i3 than print 2 1mm round disk and than glue it on the out side of the bearing for extra strength

Made one of these - works great paired with http://www.thingiverse.com/thing:160636

Prusa i3 x-belt tensionner upgrade

FYI, your model with the built-in supports does not include a support for the center cutout.

Yes, that needs to be remedied. The hole ends up working, but starts out messy. Meanwhile, I find that the ones in the other orientation tend to come out pretty good.

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