I appreciate the clarification! I think that is a good point and could possibly contribute to the fine VFA at lower speeds more than the mid-speed VFA on X-axis? Though, since the X1 uses two wheels driven by a single motor, I can’t really imagine how they’d be anything but synchronized…
Wild about the Creality skipping it on one axis! On Bambu I think it’s not the issue (or if it is it’s not the one I’ve been fighting) since its intensity would change more based on speed, would have a different wavelength at different speeds, and generally speaking I haven’t seen ringing more on one axis than another.
I think the really troublesome thing about solving this issue is that the components theorized to be to blame are extremely hard to troubleshoot. Putting in random tooth inserts and stuff is never going to accurately compare to a solid pulley of the exact right diameter. In my tests in that avenue, I could clearly see that any mismatch in the number and spacing of teeth would result in the rise and fall of the belt every 3-4 teeth, depending on the mismatch. That manifested as a few widely spaced extra large bumps in the VFA (which further suggests to me that the issue is the pulleys.)
When I get the new axis in with the split-loop belt, I’ll report back. It will also be interesting to see if the carbon axis bearings have significantly differing play between the old and new components as I have some suspicion that slop in them could be allowing the belt-vibration to manifest more/less in different printers. I question the choice of these carbon rods more all time because when the belts are off you can feel the Y-bearings are both tighter tolerance and lower friction.
Have you followed Nebur’s look into this matter? If not, you may find it interesting reading:
This paraphrase is probably not doing it justice, because I’m going by memory, but he found that the carbon rods and/or the parts holding them had deformation under the belt tensioning, resulting in a touch of inadvertent non-uniform sticking as the x-axis bearings moved along them, enough to cause VFA’s.
He was working on a hardware solution. I just now pinged him to see how that went and whether he has any kind of update.
I remember reading that at some point yeah. But I don’t think the last time I saw it that anything had come of it yet. I’ve kind of developed the conviction that the carbon rods is a gimmick. While they may weigh less than steel, they seem to introduce a few more problems which may include sloppy tolerances, higher friction in general, and they’re very prone to damage.
I used to believe in upgrades, because not long ago what alternative was there? The new paradigm seems to be: maintain as best you can, but otherwise keep as-is, sell as-is, and just roll whatever you can recoup on the re-sale into the next, better-thing when it becomes available. If you upgrade it, it becomes an unknown quantity for anyone who might buy it, and by this argument, it becomes less valuable to them, and you don’t get as much on the re-sale. Maybe even much less, or nothing at all. Ironic, isn’t it? Way different than how things used to be.
On the other hand, the re-sale value probably won’t be very high anyway, so you may not want to sell at such a low price and therefore keep it. In this case, you might as well upgrade it, because then at least it’s good for what you want, until you decide it’s obsolete and scrap it.
I haven’t yet made up my mind between these two very different ways of looking at things.