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[Solved] Did I damage my steel plate?  

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Paul Cobbaut
(@paul-cobbaut)
Eminent Member
Did I damage my steel plate?

Hello,

did I damage my steel plate?

There is a closed loop line of visible damage (though I can't feel it). It is hard to take a picture of this line so I put the plate and the last printed object on a flatbed scanner.

The line on the steel plate is identical to this crack (and some edges) on the last printed object.

I hope this picture is clear, I mirrored the bottom of the object so it is easy to see that it's the same line.

 

I have printed about twelve objects before this one, and never saw any damage. I am still using the same silver filament that came with the printer. I have not moved it. I have not adjusted the Z-axis for this object. It is a pre-assembled MK3S, bought in July, but only using it since two weeks.

The stl file was mostly generated by a python script that I wrote for FreeCAD.

I noticed that the one wet tissue that came with the printer, that this left straight visible lines on the plate.

I must have made a big mistake somewhere, please point this out. I am eager to learn.

Paul

Best Answer by RandyM9:

Probably just PLA residue on the build plate. It’s not unusual to see some edge shadows after some prints.

If it’s transferring to new prints, you have to do a better job cleaning the build plate. You can try 90% or better IPA and/or wash it in hot water with plain dish soap, hot water and a new sponge. Dry with paper towels and handle by the edges only.

Many threads here on sheet cleaning and many methods and opinions.

Cheers

-- Sent from Debian

Posted : 27/09/2022 8:32 pm
Paul Cobbaut
(@paul-cobbaut)
Eminent Member
Topic starter answered:
RE: Did I damage my steel plate?

I should add that I changed the perimeter setting in the slicer (to make it waterproof). To 4 or 5. I can provide the .stl and .gcode file if this is needed.

-- Sent from Debian

Posted : 27/09/2022 8:41 pm
RandyM9
(@randym9)
Reputable Member
RE: Did I damage my steel plate?

Probably just PLA residue on the build plate. It’s not unusual to see some edge shadows after some prints.

If it’s transferring to new prints, you have to do a better job cleaning the build plate. You can try 90% or better IPA and/or wash it in hot water with plain dish soap, hot water and a new sponge. Dry with paper towels and handle by the edges only.

Many threads here on sheet cleaning and many methods and opinions.

Cheers

Posted : 30/09/2022 4:06 am
Paul Cobbaut
(@paul-cobbaut)
Eminent Member
Topic starter answered:
RE: Did I damage my steel plate?

Thanks. I doesn't seem to affect other prints.

-- Sent from Debian

Posted : 30/09/2022 7:42 am
Neophyl
(@neophyl)
Famed Member
RE: Did I damage my steel plate?

The bottom of your print indicates that it warped upwards and detached from the print bed in those corners.  Quite common on large blocky objects as the plastic cools and contracts slightly on each layer as the stresses build up.
To me it looks like the forces has stressed the glue that holds the PEI sheet to the steel underneath.  Also quite common.  Heat and repeated use tends to 'reset' that and the tiny bubbles you can just make out  along the interface edge will get reabsorbed back into the glue.  Normally people just flip it over and print on the other side for a bit.

In future though for those types of objects you want to use the common anti warping techniques.  Stable room temperatures, no drafts, possibly use the draft shield option etc etc.  That will minimise the stress on the sheet and help.  Cleaning the sheet as Randy suggests is a must as that will increase adhesion and help with nthose corners lifting.  

Posted : 30/09/2022 8:36 am
Paul Cobbaut
(@paul-cobbaut)
Eminent Member
Topic starter answered:
RE: Did I damage my steel plate?

Thanks Neophyl. I have ordered the enclosure to control temperature. And yes I clean with IPA right before each print.

-- Sent from Debian

Posted : 30/09/2022 8:39 am
Diem
 Diem
(@diem)
Famed Member

Those bubbles usually cure themselves as long as you don't repeatedly print the same part in the same place on the bed.

Cheerio,

Posted : 30/09/2022 2:40 pm
jsw
 jsw
(@jsw)
Famed Member
RE: Did I damage my steel plate?

You might take a plastic straightedge or scraper and press down to try to re-attach the adhesive.

When I re-skinned one of the Prusa build plates, I had to do that when I applied the new PEI sheets.

Posted : 30/09/2022 2:49 pm
Paul Cobbaut
(@paul-cobbaut)
Eminent Member
Topic starter answered:
RE: Did I damage my steel plate?

Indeed! I have printed several times now, and the original bubbles are all gone. New ones arrive, but they also disappear with the next print.

Posted by: @diem

Those bubbles usually cure themselves as long as you don't repeatedly print the same part in the same place on the bed.

Cheerio,

 

-- Sent from Debian

Posted : 03/10/2022 8:38 am
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