Anet A8 (Prusa i3) X-Axis Belt Tensioner

by lokster, published

Anet A8 (Prusa i3) X-Axis Belt Tensioner by lokster Mar 22, 2017


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Yet another X-Axis belt tensioner for Anet A8 and other Prusa i3 designs I designed from scratch in Blender.
You can use the stock smooth pulley or a toothed GT2 16 tooth pulley (with 3mm hole).
This tensioner does not bend the Z rods - it uses the X smooth rods for support.
The only additional parts it requires is 3x M3 threads + nuts. Use whatever lengths you have & can fit.
It DOES NOT require longer than the stock belt, and does not hit the extruder when you try to go to X=220 :)
When slicing, do not rotate the objects - leave them as they are (otherwise the will be weaker), and allow supports everywhere.

Check out more of my stuff on http://lokspace.eu!

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Anet A8









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If anyone has problems with slicing the object with simplify3D check this "thingi".


Anet A8 (Prusa i3) X-Axis Belt Tensioner Improved+Simplify3D slicer problem solved

Could I persuade you to increase the height of the idler opening so a standard 20t 16mm idler will fit? Its 16mm in dia. across the flanges. Please.

I tried to print the model, but its not manifold (not watertight) and has double faces. So Slic3r could not deal with it properly.

I have made this, and I am using it currently.

I have a suggestion.

Make the end piece, which pulls on the pulley arm, much much stronger. My end piece is bending about an eighth of an inch outwards at the bottom because the rod it is pushing against is slightly longer, or the hole it goes into on the left side of my Anet A8 is not as deep as the hole above it.

I have greased the rods so they go into their holes more easily. It is still very difficult to get the rods to go all the way in.

Anyways, the end piece needs to be much stronger to resist bending. If you could improve that piece, this would be a much better creation, I think.

Thank you.


I remixed it and now it doesn't bend: https://www.thingiverse.com/thing:2461317

Anet A8 (Prusa i3) X-Axis Belt Tensioner reinforced

It turned out great! It's rock solid. Well done, and Thank You!

Thsnks, I'll give it a try

Son of a B! There's no HOLE for the wheel!!!!! And there's no hole for the screw in the plate!!!!!

How should I go about removing the supports inside the pulley?

There's a problem when slicing it with Simplify3D > http://i.imgur.com/WkJ7MwM.png

Thanks for the heads up. I will fix the mesh.

I have the same problem

Still the same problem, anyone found a solution? I tried to fix the mesh with an online tool, but the holes went missing...

I've fixed the "thingi" that wasn't slicing well with simplify3D


Anet A8 (Prusa i3) X-Axis Belt Tensioner Improved+Simplify3D slicer problem solved

Nice! Thank you! :)

Give a shout if it works for you!

I just tried it, works perfectly well.