Belt tensioner

by Misguided, published

Belt tensioner by Misguided Jul 15, 2011

Featured Thing!

48 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps



Public Domain
Belt tensioner by Misguided is licensed under the Public Domain license.

Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

39172Views 11147Downloads


After seeing the Ultimaker Belt Tensioner by psync (http://www.thingiverse.com/thing:10034), I decided to model my own that didn't need a screw. But of course there's also Roboteer's Paperclip belt tensioner (http://www.thingiverse.com/thing:4535)

Note: It's been mentioned in the comments that there isn't enough space between the new style Ultimaker slider blocks and the belts. Which causes the tensioner to hit the blocks.


Hook the tensioner onto the belt (as per the picture) in such a way that it won't interfere with movement.

If you need more tension, make the part thicker (or make the post width thicker). Need less tension, make the part thinner

If it's too difficult to hook on, make the part longer.

All Apps

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

Treatstock is an online platform that offers decentralized manufacturing services such as 3D printing and CNC machining for business-to-business and business-to-consumer sales all over the world. W...

App Info Launch App

3D print your favourite design with NinjaPrototype, a professional 3D manufacture with consistent quality and speed.

App Info Launch App

Does this get in the way of the extruder moving all the way to the side?

So great! Just so people know one way it'll catch on the frame, flip it and your golden.

Mine would catch on the frame..I just flipped it over and it was fine.

Work great on my Velleman Vertex k8400! Took 11 min to print, totally worth it!

Works fine on the Velleman Vertex (K8400).

The simpler the better. Does the job perfectly!

WOW. This saved my printer. My printer would print fine on simple blocks and straight things, but whenever I tried to print something more complicated it would shift layers really bad. I tried to tighten my belts but I just couldn't get them any tighter. I printed this and put it on my Y belt and It fixed immediately.
Thanks so much for thinking of this! It saved me a lot of frustration.

HICTOP Prusa i3

No-Go in the latest Ultimaker revision...  (november 2012)

You have to max out an axis and place it on the opposite end bud, otherwise it will hit. It works on Ultimaker 1 and 2, as well as Grid2 and Replicator 1 and 2.

Did 4 of them some week ago, no problem!

I printed 4 of these for my ultimaker, and I ran into a problem. The new style slider blocks are so large that they hit these belt tensioners. So I had to take them out again.

You could try to shorten the tentioners down a bit, thus making them shorter. That should work

That's a shame. How much clearance is there between the belt and the blocks?

I'll take a measurement later, but it depends on the X or the Y belts. I think the Y belts worked, while the left X belt hit the tensioner. It only scraped the corner, but enough to make the motor skip steps. (And with a loud enough noise for me to abort the print that instance)

I'll see if I can take a photo of the problem.

Forgot to take a photo, but there is like 2mm of clearance at max at the problem belt. It's the left belt for me that causes these problems. (if you look at the machine from the front)

I'm assuming that the problem should manifest on the right belt as well?

But 2mm isn't much room to play with... I'll have a think/play and see if I can come up with something.

My circles came out a bit oval the other day, having checked every other option the belt tention was the only thing I could fix. I tried fitting these again, and you can fit them, but you need to have them the other way around then the photo for the Y belts.

With that new position, is there still the issue with the tensioners hitting the new sliding blocks?

As long as the tensioners are placed with the middle post on the side of the belt facing the block I have room to spare, even on the Y axis.