RE: 6.5.3-RC Firmware for Prusa CORE One(+)

OK, so still haven't fixed the BSOD (I guess it's "black screen of death" now?) on boot up and I've noticed that the old bug where the heat sink fan pulses when at ambient room temperature is back. Both of these are not really show-stoppers, more annoyances that should have been fixed 6 months ago. 

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

Just did input shaper calibration with 6.5.3.RC 

• X MCV 46Hz
• Y MCV 48Hz

Compared to 6.5.3beta 

• X MZV 46Hz
• Y ZVD 66Hz

Whats the difference between MZV and ZVD in y axis?

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

This is exciting!

So, up to 9 seconds were shaved off of the MMU filament changes. Roughly what percent change is this?

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

I'm still using the beta. Should probably update to the RC. I finally hooked up my accelerometer and got X-MZV-46 Hz and Y-MZV-46. Did it a couple times with the same results, so accepted them. They match, so reversal wouldn't matter! Defaults were 60 and 50 Hz, EI. The stepper routine claimed something like 85% reduction in vibration, and it does seem much smoother and quieter. I've got a part printing so will see what it looks like in an hour or so.

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

This:

Updated default input shaper profiles [C1, C1L]

and this:

If you have Core ONE L or an accelerometer accessory, we recommend re-running your input shaper calibration

kinda contradict...  if input shaper on C1 was also updated, isn't it that C1 owners should also recalibrate, not only C1L owners?

RE:

Posted by: @protoncek-2

If you have Core ONE L or an accelerometer accessory, we recommend re-running your input shaper calibration

kinda contradict...  if input shaper on C1 was also updated, isn't it that C1 owners should also recalibrate, not only C1L owners?

That's what it says -- recalibrate if you can. Which requires you to either have the accelerometer accessory if you have the Core One, or the Core One L which already has it on board.

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

That's what it says -- recalibrate if you can.

Oh, yes, i see that "or".. well, ok, but i still think it should be written more clearly. It's easily missed, so more correct would be:

If you have Core ONE L or Core ONE  with an accelerometer accessory, we recommend re-running your input shaper calibration

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

MMU menu item "Preload all": After the update, the user is asked for the filament type (PLA, PETG, etc.).

However, the preloading only ensures that the filament tips are correctly positioned in the MMU. The filament type is irrelevant here.

MMU menu item "Preload to MMU": After the update, a filament type can be specified for each slot. I don't know what effect or advantage this is supposed to have: isn't the filament type determined by the G-code anyway?

If this isn't desired, the display for each slot is filled with the text "Do not change". There's no option to deselect this or restore the previous settings.

RE:

@girak

So, the 9-second saving equates to a 20% saving.

For example, this project requires approximately 2300 filament changes.

https://www.printables.com/model/1515625-multicolor-earth-lithophane-four-colors

A 20% saving is definitely noticeable. (23h vs. 28h) Only filament change time !

But this is actually a job for INDX or XL.

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

Posted by: @docsascha

Just did input shaper calibration with 6.5.3.RC 

• X MCV 46Hz
• Y MCV 48Hz

Compared to 6.5.3beta 

• X MZV 46Hz
• Y ZVD 66Hz

Whats the difference between MZV and ZVD in y axis?

odd... wouldn't I expect a large number like 66 Hz on X first as it has considerably lower mass to accelerate?

Could be wrong but I remember my also-CoreXY-Voron's tuning is according to this theory.

Speaking of which, check Klipper documentation for details on the algorithm and why 'Z..' is usually not the best choice (narrow notch is too sensitive e.g. when printhead position and most importantly temperature change, compared to cal data collection)

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

The accelerometer is an accessory for the C1/C1+, it's part of the delivered product on the C1L, so you can't run it if you don't have it..

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

Just ran the IS calibration on a Core One with 6.5.3-RC and the results were:

• X: 48Hz MZV
• Y: 56Hz ZVD

Which are almost identical to the -beta results (1Hz difference in Y, was 57Hz).

Looking at the changes in the code I see that the new defaults are:

• X: 60Hz MZV
• Y: 48Hz MZV

Which are almost the opposite of what I have, in terms of axis. Wondering if there's still a bug somewhere or if my machine's just a bit weird.

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

Can we please get some official 0.25 nozzle profile for mmu or at least solid guidance for tuning it. I need my 0.25 but I've managed to severely clog 2 of them so far in testing...

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

That does seem a bit odd. I wonder if something contaminated the measurement or table/bench has some resonance. Still, the results are so close to mine that I wonder if people without the accelerometer could just use an average of what a few people here measure.

Posted by: @docsascha

Just did input shaper calibration with 6.5.3.RC 

• X MCV 46Hz
• Y MCV 48Hz

Compared to 6.5.3beta 

• X MZV 46Hz
• Y ZVD 66Hz

Whats the difference between MZV and ZVD in y axis?

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

The picture from the 6.5.3beta input shaper calibration results 

RE:

For a properly setup printer, the simple spring-mass resonance of the moving parts should be the dominant peak and that sits (by necessity, since Y moves the whole gantry but X only the head, both being suspended by two equal-length belts at equal tension) lower for Y than for X.

What I suspect for your ZVD-at-66 Hz optimum is that there is some weirdness at higher frequencies that shadows the baseline resonance. Overdriving amplitude is one way to run into this issue, but it's not under user control in Prusa (they didn't "crank up the volume" by chance with the new firmware? I haven't tried yet).

But, anything loose or rattling can lead to similar nonsense results so check for loose screws etc first. Listen to the printer during calibration. If anything rattles, don't be shy to use it as diagnostic tool, touch parts during calibration to check where it's shaking, then discard the result.

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

I updated to the RC version, re-ran the accelerometer calibrations, and got a 1 Hz difference between it and the beta. Things seem be functioning OK, though it's the first time the phone app showed the printer off-line when it was printing. Buddy camera was still working and showing real time video, so I know the printer wasn't off-line! It's much quieter than it was. Print quality is good, with a trace of vertical artifacts if the light is just right. Not really noticeable unless you were looking for them. Knowing that it works, I just started a 6-hour taller print, and we'll see how that does.

I just installed the advanced filtration system and am not thrilled with the whole design. I think some mods are coming up and I can envision how the firmware might handle that a bit better, though I'm not sure of the details of its current operation.

RE:

This is annoying... If the chamber approaches 60° a warning dialog pops up on the UI that the chamber is over heating and needs to be vented. I don't remember the exact wording. I'll try to capture an image next time it happens. 

RE: 6.5.3-RC Firmware for Prusa CORE One(+)

Well, i guess that there are "things" inside which are not happy with temperatures above 60 degrees... entire printer must be built from the start with high inside temperatures in mind. C1 obviousliy isn't...