I found a thread to a similar problem to mine but the thread was already closed. I just want to share my own fundings. The problem was that especially on small circles the circles where unround and unclosed after adding the x and y expansion to my sculpfun s30 pro. Long story short, the stock belts from sculpfun are way to elastic for the distance of thr expansion. Just bought stiffer, glasfiber reinforced GT2 6mm belts and everything is smooth as it used to be
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Thank you for letting us know about the need for an upgrade to glass-fiber reinforced 6mm GT2 belts.
If you share a link to the other thread, I’ll link your solution so others can find it more easily.
I’m still setting up a new machine with an extension. I have been concerned about belt dynamics since before I decided to buy it. I’ll definitely keep this post in mind if my first full scale runs exhibit any geometric aberrations.
I run Gates belts in my printers but didn’t want to tear this brand new machine apart for no reason.
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This is the post I was referring to:
And please remember to recalibrate your steps after changing belts
Thanks for sharing this. I’ll revisit the original post shortly.
Recalibration might inadvertently direct people toward axis calibration which shouldn’t be necessary here. The step size or steps per mm shouldn’t change without changing pulleys or something fundamental.
The axis length changes so it’s either $130 or $131 that changes.
More here about that:
grbl/doc/markdown/settings.md at master · gnea/grbl · GitHub
I had to change my steps. But that may be because I calibrated them to the sculpfun belts before and the steps needed some fine tuning. Before calibrating them again I had an error of around 3-4mm on 800m travel
Thank you for the clarification. I would not have thought the tolerances or deflections would have been half-a-percent but it seems possible and reasonable.
It makes sense. A small error at 400mm, which would go unnoticed, would be double at 800mm. Same principle as Incremental programming.
@DerChristian Did this fix the circle problem? I am having the same issue.
I am also having letters spaced irregularly.
Let me know, Thanks GD
You problem is different. You are using a rotary. In that case, you need to adjust your settings because of the very different mechanics and movement principles. Check here for tips:
E.g., don’t use line mode, always use fill with scanning along the object. Make sure it can’t slip.
@misken Thank you! It does seem to have solved the problem with the exception of the flat on the edge of the one circle, but that could be from my image. I am not really happy about turning a 10min job into an hr, but I am able to bump speed up a lot. So, more tests and i guess I won’t be selling wine glasses with hollow text for now. Thanks again! GD
