Crash detections now I have the printer in an enclosure  

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jessica.kinchin
(@jessica-kinchin)
Active Member

Hi Guys and Girls,

So now I finally got the plexyglass and have my Lack enclosure built and ready to print ABS.

Has anyone had problems with the enclosure creating random crash detection (no actual crashes), I never had it when I was printing without an enclosure and that included ABS. The temp today (it is hot here this afternoon, but that will not last) inside the closed enclosure is between 40-42C. Is this the reason, and should there be vents in it to allow excessive heat to escape? A lot of users seem to have made this Lack build so it must be something noticed before?

I am currently running it with doors slightly open to keep the temp to about 35c not sure yet if it has cured it, hard to prove a negative but will be printing more on Monday and see

Jessica

Posted : 31/07/2020 3:45 pm
jessica.kinchin
(@jessica-kinchin)
Active Member

Quick update I looked at the stats after the last print of the day was complete and they are all Y crashes!

Posted : 31/07/2020 4:58 pm
peter.m26
(@peter-m26)
Honorable Member

After moving a printer do a z-calibration.

Clean all rods, clean all rods and put oil on rods.(every few rolls you need to do this).

Check if the y -axis, the bed is not hitting the back of the enclosure, the cable can hit something.

Check if you move the y bed by hand without power if goes smoothly.

This post was modified 3 months ago by peter.m26
Posted : 01/08/2020 10:36 am
jessica.kinchin
(@jessica-kinchin)
Active Member

So I am back at work, and I printed a 60deg bed wire cover to be certain that the y-axis is not hitting anything. This it printed without errors, rebuilt the bed and did a XYZ cal and reset the Z offset. Then started a panel print. This print is maximum in the x-axis when using 3 layer brim. First layer printed ok, but almost all other layers it does an auto home when starting the layer where it draws the same circles for holes in the panel, then picks up where it stopped. Again these are Y-axis crash detentions.

All rods are clean and move freely

Posted : 03/08/2020 5:07 pm
peter.m26
(@peter-m26)
Honorable Member

Does the nozzle hit something, like filament from earlier layer?

Check the extruder if parts are loose of the extruder, move with your hand the extruder up and down, to see if the extruder has too much play,

check bolts at the back of extruder.

And check the belts on y-axis again.

Do print a few different parts on different places on the bed.

Posted : 03/08/2020 7:25 pm
jessica.kinchin
(@jessica-kinchin)
Active Member

Hi and thanks for the input,

There are no obstructions, and it can print all other parts, the extruder is rock solid, belts are tight/have not loosened, I have not tried printing further up or down the bed, it will not fit at 90deg or anyway left or right. I have attached a video of it happily printing until it gets to the hole perimeter after perfectly doing one a couple of cms before it and others after it once it auto homes (twice)

[video width="960" height="540" mp4="https://forum.prusaprinters.org/wp-content/uploads/2020/08/New-video3.mp4"][/video]

Jessica

Posted : 04/08/2020 11:12 am
peter.m26
(@peter-m26)
Honorable Member

Belt y-axis to tight?

Check all bolts of the y-axis?

If you print slower, what happens then.

You can disable the detection of crash or print in silent mode, then the printer will not stop, but this is not the solution.

 

Posted : 04/08/2020 2:20 pm
jessica.kinchin
(@jessica-kinchin)
Active Member

I have loosened the Y axis and checked bolts, I am able to squeeze the belt together without much pressure but still solid against a locked Y motor. I have now rotated the print 180 so the hole is on the other side of the print and it still does an auto home when it attempts to print the perimeter of the hole starting on the 3rd layer (0.6mm) all the way until the hole is no longer printed. Then at layer 19 (3.8mm) it start homing on all four outer holes. This is so strange. I have printed variants of this panel a number of times in PLA, this is the first time in ABS as I have the enclosure. However I have printed a lot more complex panels in ABS. This is the only one so far that is causing an issue. As you see, it is quite capable of printing the complex gyroid fill. I am about to try reducing the speed of the external and small perimeters to 25/15 mms see if this helps. Something to do with the filament now being pulled through the hole in the top of the enclosure vs the diameter size of the holes?

I have attached some photos

.

Also not above, why is it not able to print the whole plate on the left side, the supports are compressed? They print to the edge on the right and Prusa slicer does not give a size error.

Note above the four mounting holes are countersunk so the hole gets larger as the print goes on.

I am trying more prints

Jessica

This post was modified 3 months ago by jessica.kinchin
Posted : 05/08/2020 11:49 am
peter.m26
(@peter-m26)
Honorable Member

Left side print, check if your x axis can go all the way left and to the wright, and look at the back of the extruder if there are cables or other hardware on the wrong place. There is only a little room at the back of extruder, if the x-axis can not go all the way you possible missing a little in x-axis size. The xyz calibration could correct this if you find something that is wrong.

For you hole problem, I think you should ask prusa help desk.

 

Posted : 05/08/2020 4:56 pm
peter.m26
(@peter-m26)
Honorable Member

On the forum I read, it could also be a motor that is getting to hot, because you had before no problems without enclosure.

You could try to low extra air in the enclosure, or make a temporary cooling fan to point on the y-axis motor, to test if it is gone.

Posted : 05/08/2020 8:28 pm
jessica.kinchin
(@jessica-kinchin)
Active Member

Ok folks, thanks for all the help. I think some of it may be my fault. Just before putting the printer in the enclosure I had a major blockage in the ptfe tube with some bronze fill PLA and had to take the extruder apart to remove it. I seemed to had put the extruder fan back the wrong way round. This meant the screws protruded too far from the block and caused it not to be able to zero in the X correctly hence not being able to print full bed. So I am not sure how this can effect the Y axis crashes and printing now to see if it does and cures my problems.

However I have a couple of other issues best put on another thread, but will report back later if this problem has been solved

Thanks again for help and if anyone can explain the effects of the fan being reversed it would be helpful

Posted : 06/08/2020 11:41 am
jessica.kinchin
(@jessica-kinchin)
Active Member

I have been trying to solve the original problem (fake y crash detections) with help from the help desk. My X axis belt was a little tight, Y was correct so that was adjusted. With all the things I have done I am now getting better (still a few crash detections) results. It still has the odd crash, and more than anything I think it is temperature related. My ABS is at 245C and closed enclosure getting the air temp to 40-42C. Whereas, my PLA is 225C and an open enclosure that today with a ambient temp in the upper 20's is about 30C and I am not getting any problems. I will live with it as it does not effect my prints.

Thanks for the help

Posted : 11/08/2020 11:49 am
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