Advanced Filtration after printing / z-motors not being shut off  

RE: Advanced Filtration after printing / z-motors not being shut off

Posted by: @dzt_prusa

1) After printing, the advanced filtration just stops, even though I set it to 10min filtration after printing. Does this depend on the filament type printed?
E.g. PLA: no filtration, ASA filtration

2) After printing, the z motors are not shut off. It's a whispering which is always present after printing until I disable all motors via the menu.

1. Correct, by default it only does this for certain materials (like PA/Nylon for example). If you go to the Chamber Filtration menu and scroll down, you can switch on "Filter All Materials" 

2. I'm not sure what that is. If it is indeed coming from the motors then it is not normal. 

RE:

Not sure the Z motors are turned off by default when a print ends…I would’ve thought that with a heavy print on the bed, if the z motors were disabled completely that would cause the bed to drop on its own.

Im not at my computer right now but if you check prusaslicer custom gcode -> end print it will tell you there what gets disabled when a print ends…I could well be completely wrong though 😂

what I know for sure though, if you disable all motors, it really doesn’t take much pressure near any one of the z screws to lower that part of the bed, and obviously when you do that the z alignment needs recalibrating…so Im guessing the z motors are left on so that re-alignment isn’t needed very often.

RE: Advanced Filtration after printing / z-motors not being shut off

Yeah its as I suspected, in the end print gcode is this line :

M84 X Y E ; disable motors

So that's everything except Z disabled, I'm guessing for the reason I mentioned earlier regarding the Z-alignment.

If the noise is bugging you, you could add a 'Z' alongside X, Y & E, but you'll probably tilt the bed just removing the print from the plate, so unless you want to be recalibrating Z every print I'd leave it alone.

RE: Advanced Filtration after printing / z-motors not being shut off

Many thanks for the answers. 😊

Unfortunately, I could not find a filament specific setting for the filtration. Are you referring to the slicer or the printer setup?

Adding 

M106 P4 S255
G4 S120
M106 P4 S0

to the end of the gcode forces the filtration to run for 2min at max. speed. So that would in principle work for me. The print status is 99% during this.

I also tried adding M84 to the end of the GCode:

M84 X Y E ; disable motors
; max_layer_z = [max_layer_z]

M84;

but it seems that after the code I can add  in Prusa Slicer, the bed is lowered by the printer - without the need of a command.

Right before finishing the job by 100%, the z motors are activated again and thus, it appears to be impossible to switch them off after printing - by code. 

I'm a bit afraid that letting the motors keep the level all the time stresses them. (Btw., the "noise" is at certain z positions more recognizable than at others. )

RE: Advanced Filtration after printing / z-motors not being shut off

Posted by: @gb160

Yeah its as I suspected, in the end print gcode is this line :

M84 X Y E ; disable motors

So that's everything except Z disabled, I'm guessing for the reason I mentioned earlier regarding the Z-alignment.

If the noise is bugging you, you could add a 'Z' alongside X, Y & E, but you'll probably tilt the bed just removing the print from the plate, so unless you want to be recalibrating Z every print I'd leave it alone.

That's an interesting find. I don't recall any noise coming from the Z-axis motors (or maybe I'm getting old). As soon as my print finishes I have a listen. Makes sense what you are saying. 

RE: Advanced Filtration after printing / z-motors not being shut off

You won't hear anything until the heatbreak fan stops, which takes a fair while...mine makes a bit of noise, but nothing overly irritating. 
There's a chance the noise that @dt_prusa is hearing is actually electronic noise coming from the driver chip on the main pcb.

RE: Advanced Filtration after printing / z-motors not being shut off

I double-checked and actually there are z positions without any "noise". 1-2mm further/before the noise is at max. 

Its' pretts reproducible: After starting the Core One (no print done), and moving the z axis via the printer's menu, there is a remarkable sound coming each ~4mm which disapears in between. It seems to come from the motor(s) not from the electronics but I might be wrong. It's not extremely irritating, but somehow annoying. And as I wrote, I'm more concerned about the lifetime impact. It just does not sound that the printer is in a relaxed idle state.

@hyiger: Could you please explain where I can find the filament specific filtration setting?

@gb160, @hyiger: Many thanks for your thoughts and suggestions.

RE:

Posted by: @dzt

@hyiger: Could you please explain where I can find the filament specific filtration setting?

For now, filtration is only controllable in firmware. It is on for specific filament types such as ABS, ASA, PA. It is not controllable via g-code (to be more precise an 'M' code) yet. The next version of the firmware, 6.4.0 apparently has: M147 (enforce filtration for the current print) and M148 (disable filtration for the current print). I haven't tested this though (I may later today). 

As a work-around, either set "Filter All Materials" to 'on' in the firmware or when you load PETG or PLA, set the filament type to ABS. When you submit a print with PLA it will complain it's the wrong filament type, just ignore it to continue. 

RE: Advanced Filtration after printing / z-motors not being shut off

I see. Many thanks for the explanation. 😊