# Belt tension matters!
**URL:** http://forum.3dprintbeginner.com/t/belt-tension-matters/45
**Category:** RatRig
**Created:** [February 11, 2022, 9:02am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45 "2022-02-11T09:02:54Z")
**Posts on this page:** 14
**Page:** 1
### Author:  [@Kosmak](http://forum.3dprintbeginner.com/u/Kosmak)
#### Post date: [February 11, 2022, 9:02am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/1 "2022-02-11T09:02:54Z")
Hey guys!
Dont underestimate belt tension.
I just recently somewhat tuned my Vcore3 and wanted to show how much difference ONLY belt tensioning makes. I lost my Y shaper results, but I think this still not perfect X comparison speaks for itself.
Shaper before
Shaper after
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### Author:  [@3DPrintBeginner](http://forum.3dprintbeginner.com/u/3DPrintBeginner)
#### Post date: [February 11, 2022, 10:16am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/2 "2022-02-11T10:16:08Z")
I don’t know how to read these graphs. Maybe you can tell us more about this?
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### Author:  [@Kosmak](http://forum.3dprintbeginner.com/u/Kosmak)
#### Post date: [February 11, 2022, 10:38am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/3 "2022-02-11T10:38:15Z")
First a background.
Since we are dealing with corexy, where a pair of motors operate the toolhead, It is really important to get the belt tension correct **AND** equal on both motors.
Input shaping uses clever algorithms to alter motion in real time, thus negate unwanted frequencies and reducing ringing/ghosting.
In this link you can read more on how to equal belt tension with the help of automated scripts.
[Measuring Resonances](https://www.klipper3d.org/Measuring_Resonances.html#testing-custom-axes)
The graphs I embedded are a function of frequencies during input shaping and their respective amplitudes. In other words “how much the toolhead shakes at each frequency”
There are multiple input shaper algorithms such as ZV, MZV, EI…
Each use different frequency and amplitude range to try and negate vibrations.
You can say, that the more aggressive the shaper, the more smoothing you get at edges, decreasing dimensional accuracy.
You can see in the graphs, that before I had two separate frequency spikes, thus input shaping algorithm recommended 2HUMP\_EI at 97Hz negating both spikes at @60Hz and @130Hz at the cost of higher smoothing and lower accelerations.
Once I equalled the belt tensions the spike at @130Hz hugely dropped in amplitude and shaper recommends MZV @69Hz with 0 vibrations, higher accelerations and reduced smoothing
In conclusion. Klipper is awesome 😄
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### Author:  [@WookieOH](http://forum.3dprintbeginner.com/u/WookieOH)
#### Post date: [February 14, 2022, 7:33pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/5 "2022-02-14T19:33:03Z")
Would you have any idea how to tighten the belts on an Ender 6?
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### Author:  [@Kosmak](http://forum.3dprintbeginner.com/u/Kosmak)
#### Post date: [February 14, 2022, 7:56pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/7 "2022-02-14T19:56:21Z")
Hello!
Do you use stock Marlin firmware, or have you upgraded to Klipper?
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### Author:  [@WookieOH](http://forum.3dprintbeginner.com/u/WookieOH)
#### Post date: [February 14, 2022, 8:45pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/8 "2022-02-14T20:45:50Z")
I am currently running Klipper
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### Author:  [@3DPrintBeginner](http://forum.3dprintbeginner.com/u/3DPrintBeginner)
#### Post date: [February 15, 2022, 7:21am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/9 "2022-02-15T07:21:33Z")
Are you asking how to actually tighten the belts (what screws to turn) or you are asking about the process of fine tuning the tension?
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### Author:  [@WookieOH](http://forum.3dprintbeginner.com/u/WookieOH)
#### Post date: [February 15, 2022, 4:32pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/10 "2022-02-15T16:32:18Z")
Which screws I tighten.
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### Author:  [@3DPrintBeginner](http://forum.3dprintbeginner.com/u/3DPrintBeginner)
#### Post date: [February 16, 2022, 5:57am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/11 "2022-02-16T05:57:18Z")
There are some screws in the back, next to the motors which can be loosened or tightened, according to your needs.
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### Author:  [@WookieOH](http://forum.3dprintbeginner.com/u/WookieOH)
#### Post date: [February 27, 2022, 1:30pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/12 "2022-02-27T13:30:17Z")
Would you know how to read this graph? I ran the testing custom axes script from the Klipper docs and got these results, and I don’t know how to read the graph.
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### Author:  [@Kosmak](http://forum.3dprintbeginner.com/u/Kosmak)
#### Post date: [March 4, 2022, 10:54am UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/13 "2022-03-04T10:54:24Z")
Man, sorry to get to you so late. I was off and wasnt checking forum at all.
This is Ender 6, right? The Blue graph shows a motor that moves your carriage from back left to front right. and the orange moves from back right to front left.
Your graph shows that one belt is tighter than the other. I really have no idea how the belts on Ender 6 tension tho, so I cant help you with that, sadly 😕
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### Author:  [@WookieOH](http://forum.3dprintbeginner.com/u/WookieOH)
#### Post date: [March 4, 2022, 1:08pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/14 "2022-03-04T13:08:04Z")
Awesome. Thanks man. I’ll see which one it is and tighten them. Thank you again.
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### Author:  [@ZeroEx](http://forum.3dprintbeginner.com/u/ZeroEx)
#### Post date: [March 4, 2022, 2:39pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/15 "2022-03-04T14:39:45Z")
Would improper belt tension be the cause of loud almost grinding noises at higher print speeds? I’ve been going back and forth with Comgrow regarding the issue and they have no solution. Well I take that back, their solution is to print at 60 mm/s max. LOL
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### Author:  [@3DPrintBeginner](http://forum.3dprintbeginner.com/u/3DPrintBeginner)
#### Post date: [March 4, 2022, 3:03pm UTC](http://forum.3dprintbeginner.com/t/belt-tension-matters/45/16 "2022-03-04T15:03:25Z")
You are expecting to get support for a modified printer. In this case, Comgrow cannot provide support.
It’s the same thing as modifying a car to be a race car, and wondering why you can’t get it serviced in warranty 🙂