Klipperized SV06+: significant Y axis shifting on a single layer

Aren’t the belts too tight ? it kinda looks like the motor is missing some steps or stalling at a certain point.
You can also check if the belt pulleys still have their grub screws firmly screwed in.

You were saying it was really loud after klipperization. In general with stepper motors this can also be a sign that something is wrong in a mechanical way (loosened pulley) or the step size of the motors is too large (less microstepping = larger steps = more noise).

Also stealthchop will influence the torque of the motor, so this can manifest with these problems at higher speeds

How do you adjust your belts? At what point you know you reached the correct tension?

The belts have tensioners, so I’m not sure what you’re asking for your first question.

For your second, I’ve been using as many different guides as possible to figure out how to determine the best tightness (tuning it like a guitar string, using Prusa’s pitch finder, adjusting a quarter-turn and just running a print to find the sweet spot).

Sorry if I expressed myself misleadingly in the first part. Of course I know how to adjust the belts. I disassembled and reassembled my sv06 plus because I replaced the ball bearings with drylings. But now I’m struggling with the belt tension. I also used the app from prusa. Which printer do you choose for the sv06 plus? What frequencies give you good results? I get ghosting after assembly which I didn’t have before. Therefore I suspect the belt tension. Thanks in advance

Hi,
Personally, to adjust the tension of the belt, I use that :

https://a.aliexpress.com/_Eu4EDrq

I’ve been using “Prusa MK3/S/+” on the Prusa site since the SV06 is more or less a Mk3 clone.

Thanks, interessting. How does it work? Is there a specific value that I have to achieve or how do I know that the tension is good? I have not yet used such a device.

Ok thanks. I used that one too. But I thought that because the belt lengths are different, the values should differ from the mk3. Maybe I’ll give another try

You have to insert this device on your belt and read the value.
I found the right values with google in fonction of the belt.

Thank you, i will give it a try.

Added to my wish list.
Now to find the values for all my printers.

In fact, I found two different tensions depending on the type of belt (GT2, …).
Just one point, we can’t use such a tool when the belt is too embedded into the printer and is not accessible.
This is how the tool is positioned on a belt.
I have to bend the belt to show the positioning, normally you don’t have to.

You will find all informations you need here :

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Here are the values :

Good news: I seem to have fixed the problem!

Bad news: I have no idea what it was that ended up working. I did these all at the same time, and any one of them may have done it:

  • Printed and installed 6x new anti-vibration feet (using 1in 70 duro Sorbothane half-domes)
  • Removed the front and back plastic panel covers (in doing so, I completely unscrewed the Y-axis tensioner in the front and had to retension the belt entirely from scratch)
  • Printed a desktop spool holder* and installed a reverse Bowden using a PTFE tube and two* different mounts to guide the tube, significantly reducing the printer’s shaking when moving the Y-axis

I’m not super keen on adjusting any of these back to the way they were to see what breaks, but hopefully someone who needs to can look at these suggestions and try them. If I had to hazard a guess, I’d say needing to fully reset the tension had the biggest effect.

* (full disclosure: these are my designs)

Finally I’ve refound the file to calculate the belt tension.
Enjoy

Belt tension calculator.xlsx (20.3 KB)

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