filament sensor assembly not working properly. frequent false Y axis crash detection
 
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Ty Guerin
(@ty-guerin)
New Member
filament sensor assembly not working properly. frequent false Y axis crash detection

Hi, so two problems have popped up recently on my mk3s+.  The filament sensor or something in its assembly is not working correctly at all.  When ever I try to do any print with it enabled, it will immediately stop and ask to have the filament removed and reinserted.   The band aid solution for this is just to disable the sensor, which does work,  But when I took apart the extruder in attempt to clean it out/ figure out what was wrong, I could find nothing wrong.  

The sensor fail almost immediately when I start a print. demanding that I reload the filament.  When I go to the support screen on the printer.  The sensor reads as 1 usually but will flicker to 0 every couple of seconds or so.  I can make it more dramatic just by jiggling the filament leading to the extruder.  As I've said before I have disassembled and reassembled the extruder in its entirety, but have found no cause of the problem.  Ball bearing, magnets, arm, ect.  there is nothing in the way of the sensor, the ball moves freely when I push a test pieces through,  I have tried every position of the tension bolt, and have made sure there is nothing in the tract of the ball bearing or in the way or near the sensor.

What do I need to adjust to get it working again?

This topic was modified 2 months ago by Ty Guerin
Posted : 06/10/2022 2:15 am
RandyM9
(@randym9)
Reputable Member
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

When I go to the support screen on the printer.  The sensor reads as 1 usually but will flicker to 0 every couple of seconds or so.  I can make it more dramatic just by jiggling the filament leading to the extruder. 

Try moving the cable bundle to the extruder around and see if that makes the readings flicker. You may have a broken wire that’s making intermittent contact, causing the failure.

If that’s not it, remove power and check the connections at both ends for a loose or disconnected wire or connector not firmly seated.

Cheers 

Posted : 06/10/2022 4:02 am
fuchsr liked
Ty Guerin
(@ty-guerin)
New Member
Topic starter answered:
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

Hey! That was it. I checked the cable ends originally, of course nothing was found, but on my second look I chased down the cable and found a kink in the red wire.  Now with it replaced it works just as it should. Thank you for the help!

Posted : 07/10/2022 8:40 pm
RandyM9
(@randym9)
Reputable Member
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

Excellent, glad you got it sorted!

Cheers

Posted : 07/10/2022 11:47 pm
Zoltan
(@zoltan)
Moderator
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

@randym9

have your Y axis crash disappeared as well?

even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.10.1 RC1, MMU2S, no closed box, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.3.4, Prusa Connect Beta

Posted : 05/11/2022 7:49 am
Ty Guerin
(@ty-guerin)
New Member
Topic starter answered:
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

It has not.  I am still not sure what is causing it. I realize that I didn't actually put anything about the Y crashing.

So my printer's crash detection goes crazy quite frequently if I leave it on.  It started doing it 3 or 4 months after I started using it.  It usually starts find and normal, printing whatever it needs to.  but I'll say when the prints gets to about an inch tall it starts tripping the crash detection from the Y belt...a lot... current numbers are 31 X crashes, and 643 Y crashes.    The crashes continue through out the rest of the print is no discernable pattern.  it doesn't trip in the same spot on different layers,  it doesn't trip after a certain amount of time, sometimes it trips multiple times a layer, and some times not at all, and it doesn't matter how big or small the print is. It will trip completely randomly. To be honest I would almost be okay with it constantly tripping if it the crash didn't occationally cause either belts to slip, causing a layer shift, more or less ruining the print, which I think is just the printer failing to home and find the precise location where it left off.

I have stared at the print as it goes and trips, and cannot see anything wrong with it.  No breaks or separations or over extrusion boogers.  Belt tension is X at 263 and Y at 267, Which as I under stand it is fine for it to be set it.  I've replaced both X and Y belts just to be sure.  The bed and extruder slides back and forth smoothly without needing much force.  I've cleaned and re lubed the rods several times now. Checked the wires and connection points for the motors and board.  I haven't found anything that could be the cause.  

Posted : 05/11/2022 6:02 pm
RandyM9
(@randym9)
Reputable Member
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

@zoltan -

I haven’t had any Y axis crashes myself so I can’t speak to this directly.

@ty-guerin - 

Have you tried re-flashing the firmware and doing a fresh XYZ calibration? Sometimes this can be helpful when frequent random crashes are happening. May be worth a try.

Cheers

Posted : 06/11/2022 4:08 am
Zoltan
(@zoltan)
Moderator
RE:

@randym9 sorry the question had to be for @ty-guerin

 

even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.10.1 RC1, MMU2S, no closed box, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.3.4, Prusa Connect Beta

Posted : 07/11/2022 6:23 pm
Zoltan
(@zoltan)
Moderator
RE: filament sensor assembly not working properly. frequent false Y axis crash detection

@ty-guerin

Short video would be helpfull.

even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.10.1 RC1, MMU2S, no closed box, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.3.4, Prusa Connect Beta

Posted : 07/11/2022 6:30 pm
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