@t3p3tony Hi
I think I figured out what triggers the "not working"
Printer has 2 printing heads. I mostly only use one but can see temperature on the one not used.
If it is above 57° the filament sensor has issues. Below that it works most of the time. Printed for about 120 hours without "not working" Really thought the problem just went away but got "not working" 2 times within 30 min. Saw the the temp was a few degrees higher. Lower table temp with 5 ° and open lid for a few minutes. Got temp down to 53°. Temp has not been over 57° since and no more "not working"
I know that this temp needs to be under 60° otherwise filament gets soft and stops extruding. So I have been monitoring it for a long time. At least since beginning of summer when I found this issue. When it was 30 ° plus in the workshop the filament roll was warmer than usual and that is when I had a lot of extruder stop with same parameters I had when it was colder. After a lot of trial and error I figured out the temp issue.
It was -15° outside and 12° in the shop 2 weeks ago so I printed with a "curtain" I have in front of the printer to keep the the heat in. I also raised the table temp a few degrees since some prints warped when printed close to the edge of table.
This raised the temp and filament sensor started to have gremlings.
Anyway, I finally got the email from Hobby store and sent the other faulty sensor on warranty to them.
When you get that sensor it very well might work when cold. That one had issues during summer if I remember correctly. So it might be a temperature issue.
Also thinking back I pretty sure the issues gets less frequent the further down the tables moves in Z during a print. Temperature gets a few degrees colder round the extruder the further down in Z it is. Had a print that was 550mm high and it worked without stopping the last 150mm.
Since I figured this out I moved the sensor up about 80 mm from extruder. Before it was 10 mm to minimize stretch/compression in the filament.
Now it works better.
Once I get a new sensor on warranty and plug it in we will see if LED works. If you look at our conversations about the sensors the LED stopped working on one and when I changed to my spare the LED did not work on that one either.
Sensor still worked so we did not worry about it. I guess the faulty sensor (LED not working) I sent on warranty will find its way to you sometime. It would be good if you check if LED is working.
If it is something is wrong on the motherboard.
Frank
