New VFA Tuning Method rocks!
Hi,
just wanna share my expirience on this:
https://x.com/josefprusa/status/1948847179415597372
After I tuned my CoreOne to the new 98/92 Hz with Printhead in the right forward corner (which take a while to be at 98/92), I ran the Phase stepping Calibration and after than the Input Shaper Calibrations.
This is a completely new CoreOne!
Actually printing a Test, but Vibrations a highly reduced, Printer is much more silence. Havent recognized any Resonance so far.
Compared to the "old Settings" it´s a new machine!
Please Test and post your Experiences.
Please Tune your Belts exactly. Maybe it will take a while. I noticed that when tuning the upper Belt, the lower Belt was affected to. But after a while I managed to set it reproduceable to 98/92hz. (which leads me to that my further Belt Tuning was completely off!)
If VFA is reduced too, I actually don´t know. Test is in progress. But what I "hear" is completely differnt from my "old" CoreOne!
RE: New VFA Tuning Method rocks!
Apologies for what is likely a dumb question, but "front right" would mean the closest left corner to us (the user) when facing the printer, correct?
RE: New VFA Tuning Method rocks!
My understanding is to move the Head to the front right facing the printer. Works for me
RE: New VFA Tuning Method rocks!
I tried this and it made my gantry out of alignment, one side hit before the other and homing the print head took forever (might have eventually failed, I gave up before then). Went back to stock tuning method and it's fine again.
RE: New VFA Tuning Method rocks!
The instructions on the new belt tuning site make it more clear.
1. Move the gantry to the front of the printer.
2. Move the Nextruder to the rightmost position.
-J
RE: New VFA Tuning Method rocks!
I did the conversion from my MK4 this week and used this procedure for belt tuning. I ran a few prints and them ran the input shaper calibrations and phase stepping calibration. The calibrations with the accelerometer made a big difference. So far I'm happy with the results.
I ran a VFA test before the input shaper calibrations and phase stepping calibrations and the results were comparable and maybe a little better than the MK4. I need to run the test again for comparison.
RE: New VFA Tuning Method rocks!
In my case as well, VFA's dramatically improved after the changed belt tuning (96hz, 92hz) and recalibrating the shaper with the accelerometer. Also after recalibrating the phase stepping (again with accelerometer) the printer is noticeably quieter as well.
RE: New VFA Tuning Method rocks!
Hi,
just wanna share my expirience on this:
https://x.com/josefprusa/status/1948847179415597372After I tuned my CoreOne to the new 98/92 Hz with Printhead in the right forward corner (which take a while to be at 98/92), I ran the Phase stepping Calibration and after than the Input Shaper Calibrations.
That's good news. A couple of questions:
1. What is 'phase stepping'? Is it the similar concept to 'micro stepping'?
2. Does the new tuning improve also the X/Y homing?
RE: New VFA Tuning Method rocks!
Hi,
just wanna share my expirience on this:
https://x.com/josefprusa/status/1948847179415597372After I tuned my CoreOne to the new 98/92 Hz with Printhead in the right forward corner (which take a while to be at 98/92), I ran the Phase stepping Calibration and after than the Input Shaper Calibrations.
That's good news. A couple of questions:
1. What is 'phase stepping'? Is it the similar concept to 'micro stepping'?
2. Does the new tuning improve also the X/Y homing?
I found this article that explains it.
It greatly reduced the noise and vibrations on my CORE One.
Homing seems to be the same where it bangs into the stops several times. The MK4 also did this but not every time, the CORE One seems to do it every time.
RE: New VFA Tuning Method rocks!
I should add that both of these calibrations require the Accelerometer kit.
https://www.prusa3d.com/product/accelerometer-set/
RE: New VFA Tuning Method rocks!
I found this article that explains it.
The article explains what calibrated phase stepping aims to achieve, but does not really explain what it does. I am not aware of a more technical disclosure from Prusa.
But I assume that it tweaks either the timing or the current of the microsteps, aiming to make the actual motor movements equidistant. (Which they will not necessarily be when the motor is driven with the nominal, non-calibrated microstep progression, due to asymmetries in the motor's magnetic fields.)
RE: New VFA Tuning Method rocks!
The new belt values 98/92 Hz together with phase stepping and input shaper calibration do really improve the Core one prints. I did a test with https://www.printables.com/model/1256267-vfa-test-prusa-core-one-petg. It is difficult to see any vfa.
RE: New VFA Tuning Method rocks!
You got me curious now.
I hope nothing breaks after running these tests... will do it tomorrow.
RE: New VFA Tuning Method rocks!
Honestly I haven't really noticed VFAs on my printer in the first instance - but maybe its just because of the kind of stuff I've printed, as I've not actually tested to look for the issue either. I always go by the theory - if you're not having the issue with the way you're using the machine, then why go look for it and stress yourself?!...
However, I had the head banging for ages issue, which the latest firmware seems to have drastically reduced for me - not sure how or why, but it has.
My belts are still around 85hz I think - not 100% sure because the app didn't work too well for me, so I had to kinda guesstimate it. I did try tightening the belts by giving the screw a full turn either side after the 'new advice' was published, but it started head banging a whole lot more again - so put it back to where it was and I'm happy with that for now!
RE: New VFA Tuning Method rocks!
LOL - I get a bit like that. Don't want to try anything new in case it causes more issues than you started with!
You got me curious now.
I hope nothing breaks after running these tests... will do it tomorrow.
RE: New VFA Tuning Method rocks!
I find the method somehow troublesome. First, it results in the uneven tension of the two belts (in my case >6 Hz difference when comparing with the head placed in the middle of the furthest position), resulting in heavy head-banging. Second, tuning one belt affects the tension of the other one as well, similar as with tuning a violin, or any other wire instrument with a floating tailpiece.
RE: New VFA Tuning Method rocks!
[...] it results in the uneven tension of the two belts (in my case >6 Hz difference when comparing with the head placed in the middle of the furthest position)
Why would there be such an uneven belt tension? With the print head moved all the way to the right, the free length of the two belts along the X gantry differs by about 5%. (The lower belt is longer since its left-hand idler is placed further to the left.) The different target frequencies are about 6% apart, in inverse proportion to the vibrating belt lengths. So the resulting belt tensions should be equal to within 1%.
Where were you plucking the belts when you did your "new vs. old procedure" comparison?
RE: New VFA Tuning Method rocks!
New method: Head forward to the right, plucking in the middle of the rail.
Old method: Head backward in the middle, plucking in the middle of the belts on the left and on the right side.
RE: New VFA Tuning Method rocks!
I did not encounter any differences between belt tension with the new method. Worked really well. Just make sure you use a microphone without any noise reduction and place it close and towards the belts.
RE: New VFA Tuning Method rocks!
Second, tuning one belt affects the tension of the other one as well, similar as with tuning a violin, or any other wire instrument with a floating tailpiece.
This suggests either that your gantry wasn't square before you started to tension the belts, or that the belt tension wasn't increased evenly. I've seen it myself - if I let, say, the right tensioner get too far ahead of the left one, it will open a gap on the left side of the gantry, such that adding a bit more tension to the left side results in both belts having an increased frequency.
For me, the solution has always been to slacken them both off again, check that the ganrty is square, then go more slowly and evenly with the tensioning.