All prints fail every time sience yesterday - Prusa I3MK3S  

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victor
(@victor)
Eminent Member

Hello

Since yesterday I tried to print about 7 times and every print failed like in the image. Printer seems to start fine printing a brim but in e few minutes the PETG no longer sticks to the print bed, forms waves and the hole print fails.

I ran xyz calibration and self-test and all looks fine here. 

I made a first layer calibration and the problem is visible here also: I set a live Z adjust and all seems fine, PLA sticks to the print bed but sometimes, without tocuhing the perfectly adjusted live Z, the PLA no longer sticks well to the print bed.

 

Thank you

 

Best Answer by Tim:

On this image, the Live-Z is too low; but the spot is a fingerprint.  Alcohol does a poor job cleaning off finger prints.

Use soap and water, and leave the alcohol in the bottle.

The PEI sheet needs soap and water unless you use the alcohol drip method or use several ml of alcohol and a very large absorbant towel that makes it impossible for the alcohol to reach your fingers while wiping the bed.

Most textured sheet users have found it also needs soap and water at least once - it's the only way they have found to get PLA to adhere.

Posted : 09/10/2019 7:53 pm
charles.h13
(@charles-h13)
Noble Member

Sudden failures mean something has changed.  They this:

1.  Check the nozzle for Klingons.  

2.  IPA the bed and try a first layer calibration again.  Mage sure the square does not come apart when you pull the print off the bed.  

3.  If the print fails a second time, each the bed with Dawn and try again.  

Posted : 09/10/2019 10:10 pm
Tim
(@tim-m30)
Famed Member

By any chance did you clean the bed with alcohol before prints started failing?

 

It is always wise to get more than one opinion......
Posted : 09/10/2019 10:53 pm
bobstro
(@bobstro)
Famed Member
Posted by: @tim-m30

By any chance did you clean the bed with alcohol before prints started failing?

I think wiping the bed with Klingons is also problematic 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 09/10/2019 11:19 pm
Robert-mm200
(@robert-rmm200)
Reputable Member

And when you report problems like this, tell the type of print sheet you are using.

It matters. I can speculate from your description you are using the textured sheet.

If so, I would skip the IPA and move right to a Dawn scrub. Not every time - just when you have a serious problem.

Posted : 09/10/2019 11:51 pm
Sembazuru
(@sembazuru)
Reputable Member

Looking at the picture the OP attached with their first post I can see that it is a textured sheet. The upper right-hand corner is out of focus enough that I can't make out the batch number though.

 

Posted : 10/10/2019 12:02 am
charles.h13
(@charles-h13)
Noble Member

@bobstro

I meant nozzle Klingons.  

Posted : 10/10/2019 12:34 am
Tim
(@tim-m30)
Famed Member

Sem - people who help others for free and are donating time to provide such help should not have to dig, scrape, and hunt for, or even divine information that is required to help the person asking.  It is a total waste of time and I've stopped the practice: if I don't see enough info to help I usually post a quick rather useless comment or move on.   People who say "My printer is failing, it just started. What's wrong?" deserve the quality of help they are asking for.

It is always wise to get more than one opinion......
Posted : 10/10/2019 12:52 am
victor
(@victor)
Eminent Member

@tim-m30

Yes, I did wiped the bed with alcohol, but I wipe the print bed with alcohol every time I print. After reading this I also wiped with isopropyl alcohol and printed again but the problem is the same on the textured print bed.

So I tried to print on the original print bed that is not textured but the problem appeared on this print bed also - like the new image.

But I stopped using the original print bed with PETG because PETG was sticking to hard on it and broke the print bed in a few places.

Tim, if I would have more info I would mention it from the beginning but I don't. 

Thank you for your time and if you think I can provide more info please ask but I don't know what to provide right now.

 

 

Posted : 10/10/2019 3:50 am
victor
(@victor)
Eminent Member

I also checked the nozzle and is clean as far as I can see, I will open the heating section today to see what is going on inside. 

As the previous image shows, not only the section marked with red is a problem but all the lines that the printer layed in that section are bad, is like the print head lifted when it shouldn't. This is why I think I should open the printer and take a look inside.

This post was modified 5 days ago by victor
Posted : 10/10/2019 4:18 am
Tim
(@tim-m30)
Famed Member

On this image, the Live-Z is too low; but the spot is a fingerprint.  Alcohol does a poor job cleaning off finger prints.

Use soap and water, and leave the alcohol in the bottle.

The PEI sheet needs soap and water unless you use the alcohol drip method or use several ml of alcohol and a very large absorbant towel that makes it impossible for the alcohol to reach your fingers while wiping the bed.

Most textured sheet users have found it also needs soap and water at least once - it's the only way they have found to get PLA to adhere.

This post was modified 5 days ago by Tim
It is always wise to get more than one opinion......
Posted : 10/10/2019 5:02 am
victor liked
victor
(@victor)
Eminent Member

@tim-m30

Thank you, it printed fine the last object.

Posted : 11/10/2019 4:37 am
charles.h13
(@charles-h13)
Noble Member

It is amazing how often live Z is the issue.  Too low to too high and all you need is a first layer calibration.  

Posted : 11/10/2019 1:29 pm
victor
(@victor)
Eminent Member

@charles-h13

I don't think the live Z was the problem, but the greasy printbed.

Posted : 12/10/2019 10:14 am
charles.h13
(@charles-h13)
Noble Member
Posted by: @victor

@charles-h13

I don't think the live Z was the problem, but the greasy printbed.

Heck, that would do it.  Either way, watch the forum, you will see how often someone thinks they have their live-z dialed in and they don’t.  

Posted : 12/10/2019 11:40 am
victor liked
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