why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?  

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

file didn't attach to earlier reply…trying again. 

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

Not by my computer so carnt check file but is there any chance you can video it printing that 1 layer square I'd like to see exactly what it's doing 

Posted by: @paul-beard

3mf file, two images of the aborted job, stopped when it started peeling from the corner. 

 

 

 

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

Also soap and water clean the bed give it a good scrub

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

yes, soap and water are part of the routine. I think this plate is done, I have another ready to order. 

I can't take video of the print, I stopped it as soon as it started peeling off the bed and catching the print head. Adhesion on the back half of the plate is not great, I suspect uneven heating but can't rule out the bed surface being so trashed it's not helping. I am done with this for today, I have two machines and both decided they were doing no work today. Could be changing weather, we get a lot that here, and humidity/drafts can be factor as well. 

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

If it's pla uneven heating shouldn't affect it I'm not sure what diem reckons but I would say it's your bed that's done so I'd suggest replacing it then trying again

That's a different print you have saved your single layer square as a project.  It is failing because your print sheet has been ruined by someone using sandpaper instead of cleaning off their fingerprints and the first layer 'Z' calibration is too low.

You have other print sheets.  The underside of the first failed print you showed us would be of more interest and also project file for the print you showed us on 09/10.

Cheerio,

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

attached: 9 hour print job from today and the STL it was made from.

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

Posted by: @paul-beard

attached: 9 hour print job from today and the STL it was made from.

Can you show the other side please and can you confirm which was on bed

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

The side you are looking was on the bed.

I have a new build plate arriving tomorrow (I hope) and that should help. This thread has been helpful at demystifying the first level/adhesion issues so many of use struggle with. I have never gotten a good first layer calibration, apparently, and I think I knew that but I didn't know what was wrong or how to fix it until now. 

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

Posted by: @paul-beard

The side you are looking was on the bed.

I have a new build plate arriving tomorrow (I hope) and that should help. This thread has been helpful at demystifying the first level/adhesion issues so many of use struggle with. I have never gotten a good first layer calibration, apparently, and I think I knew that but I didn't know what was wrong or how to fix it until now. 

Ok yes your first layer is off if you need you can post photos of the first layer cal

It's a little hard to judge the first layer 'Z' calibration with such a scarred build sheet but I suspect you have it a little low.

The poor adhesion spots look like fingerprint patterns.  When your new sheet arrives institute a strict cleanliness policy.

The cleaning routine you mentioned above should have addressed this - are there any unusual contaminants in the printing environment?  We always assume greasy fingerprints or sometimes sugary ones where children are involved but if you are using aerosols in the same room, or spraying paint, laying fibreglass, arc welding ... anything that creates dust, smoke, spray... You get the idea. The bed needs to be clean.

Cheerio,

RE: why does my machine stop on the Z axis and scorch prints before knocking them off the printbed?

Couldn't agree more

Posted by: @diem

It's a little hard to judge the first layer 'Z' calibration with such a scarred build sheet but I suspect you have it a little low.

The poor adhesion spots look like fingerprint patterns.  When your new sheet arrives institute a strict cleanliness policy.

The cleaning routine you mentioned above should have addressed this - are there any unusual contaminants in the printing environment?  We always assume greasy fingerprints or sometimes sugary ones where children are involved but if you are using aerosols in the same room, or spraying paint, laying fibreglass, arc welding ... anything that creates dust, smoke, spray... You get the idea. The bed needs to be clean.

Cheerio,