MK3S keeps prompting unload filament  

RE: MK3S keeps prompting unload filament

have you tried unplugging the filament sensor? 
this will guarantee that you don't get erroneous signals from the sensor, then if the problem persists it is not in the sensor...

regards Joan

RE: MK3S keeps prompting unload filament

@joantabb

I have not tried that. So I can disconnect the IR sensor and the printer will still continue to print?

RE: MK3S keeps prompting unload filament

@joantabb

Ok problems still arise even without the sensor connected which suggests to me that it must be a hardware issue. The other problem I have is that I get incorrect belt tension results. The printer says the belt is too tight despite the belt teeth losing grip on the pulley making it quite loose, which could further support that it is hardware problems. What are you're thoughts?

RE: MK3S keeps prompting unload filament

Hallo 
Ich habe exakt das gleiche Problem. Ich habe meinen Drucker montiert, kalibriert, er hat auch den Probedruck (im Kalibrations-Modus) anstandslos gedruckt. Als ich den ersten Druck tätigen wollte forderte er mich auf das Filament zu entladen nach der Entladung habe ich neues Filament geladen dann fährt er den Druckstartpunkt an, um dann wieder in die Fillament entladen Stellung zu gehen usw....  Ich habe den Eindruck das es sich hier um ein Software Problem handelt....

RE: MK3S keeps prompting unload filament

@visayan7

Did you lubricate the linear bearings during assembly, 

If not now might be a good time to do some maintenance. 

https://help.prusa3d.com/en/guide/printer-maintenance-tips_23200

let's see if we can get the printer moving properly first. 

regards Joan

RE: MK3S keeps prompting unload filament

@rolf-2

Your problem I believe is a little different caused by the sensor which is a common issue. I would suggest turning the sensor off on the LCD to see if it still prints. You either connected the cable incorrectly (depending on the printer you have) or might need a spacer under the sensor which helps. My case is that I can print but it's after halfway where suddenly it tells me to unload as well as 1 minute before it finishes. 

RE: MK3S keeps prompting unload filament

@joantabb

Bearings have been lubricated but with WD40 white lithium grease during assembly as well as on the bar.

RE: MK3S keeps prompting unload filament

you could try loading the most recent firmware,

Do the X and Y axis move smoothly, by hand?

check that the X and Y idler wheels have a little side to side play and rotate freely, 
If motion is still stiff,  try slackening the X axis Bank Plate, about half a turn on the screws to loosen their grip on the linear bearings

If Y axis is still stiff, check for a gap between the toothed motor pulley and the motor mount and motor body
if problems still persist, try looosening the u bolts a  little

regards Joan

RE: MK3S keeps prompting unload filament

@joantabb

It had the most recent firmware and I tried an older firmware with the same results. The axis appears to move smoothly when moved by hand, I have another printer so can compare that it moves just as well as the other printer yet the Prusa layer shifts a lot more than the other printer, more when the speed is lowered.

RE: MK3S keeps prompting unload filament

@joantabb

Like I said nothing appears to be stiff. The X and Y are able to move smoothly. Maybe the bearings need more lubricant on the inside? But sorting the layer shifting is pointless until I can sort out why it keeps unloading filament even with the sensor removed,

RE: MK3S keeps prompting unload filament

Hallo
Ich war dann ein wenig blind .....!! Denn ich hatte den Filamentsensor an den falschen Slot angeschlossen seit dem ich das geändert habe ist alles gut.

RE: MK3S keeps prompting unload filament

@rolf-2

Glad you sorted out. Still having issues with mine.