Ultimaker Belt Tensioner 5000

by jamesm1, published

Ultimaker Belt Tensioner 5000 by jamesm1 Mar 23, 2012
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The Ultimaker belt tensioner 5000, directly replacing and superseding, the belt tensioner 4000, and previous 3000 and 2000, 1500, and 500e models. Got a Belt, get it tight.


I needed to tighten my belts, and i didnt really like the other deisgns, so heres mine, very compact, just pop off the three nuts(dont pull out the bolts) slip it on, loosen the pulley's to get the tension around the belt, put the nuts back on but dont tighten, adjust by pushing it(down or up depending if its front or back) and nip up the bolts. Works for me, enjoy.

EDIT, new picture to help explain fitting it.

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I added four of these to my Ultimaker and ran into the following problems:

  • When the head goes all the way back on the y axis, it ends up hitting the belt tensioner on the back sliding block before hitting the stop switch. Its the top piece of wood on the head that's hitting the uppermost piece of plastic on the belt tensioner. I am going to try to resolve it by trimm
    ing that piece of plastic off.
  • When the head goes all the way right on the x axis, the belt tensioner sticks out just enough to clip the side of the stop switch at the front. Again I'll try trimming this piece as well.

Going in the more common direction ( left on x and front on y) there are no i

I really like the concept. If there were no hitting issues I would recommend that these be included with every Ultimaker as a stock part!

I'm not 100% on the issue your having, but if my understanding of your problem is right you can put the tensioner on the other side of the sliding block, the side that doesnt approach the stop, as long as you losen the pulley grubs when you attach it the tension will be around the whole belt and so should make no difference which side of the sliding block its on, unless your running one on either side, which i didnt need to do, so i guess never encountered the problem.

That all applies provided ive not misunderstood the problem!! maybe stick on a picture if that doesnt solve your problem, and ill change the design a bit.


Wow that was a fast response, makes me feel guilty for taking so long to respond =-O sorry about that!

I will try to print up some fresh belt tensioners for those problem areas and see if I still have those issues.

Can you take a couple of more pics as to how this tightens the belt? thanks.

I will stick up some more picks, but essentially it raises the edge which the belt runs over, so you slide it up(in the case of the left and right) and down(in the back and front) to increase the tension. If you wanted to, you could put one on either side and allow for more tensioning.

If I understand correctly, this uses the existing method of the lever in the sling blocks pulling the belt taut, but it allows for an adjustable gap the belt is pushed in.

I really like this for its simplicity, and it is easy to incorporate into the existing design. If you have it, please also post the vector drawing so it can (eventually?) be rolled back into the ultimaker drawings.

Im happy to put up any format i can, it was drawn in solidworks, so dxf or dwg OK?