[Solved] Cleaning the steel sheets (smooth and coated)  

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@towlerg

Not really - as they and others who understand fingerprint content, alcohol dissolves the oil, but does not dissolve other stuff the finger or palm left behind: nor does the alcohol remove the materials dissolved from the surface. Alcohol is a solvent, not a surfactant. And, that final statement in the article is about making the finger print invisible to the eye: not actually cleaning the surface.

A streak test will show the materials that remain after an alcohol bath. Dampen a piece of a paper towel with alcohol, with a fingertip, run it across the print sheet that you think is clean. If you see any streaks or rainbow effects in the wet area as the alcohol evaporates, the bed has stuff on it.  Take that sheet to the sink, do a thorough soap and hot water wash - rinse until the water is sheeting off - dab the few remaining drops of water with a fresh paper towel. Repeat the streak test. 

 

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 28/10/2020 2:47 pm
cwbullet
(@cwbullet)
Famed Member
Posted by: @tim-m30

@towlerg

Not really - as they and others who understand fingerprint content, alcohol dissolves the oil, but does not dissolve other stuff the finger or palm left behind: nor does the alcohol remove the materials dissolved from the surface. Alcohol is a solvent, not a surfactant. And, that final statement in the article is about making the finger print invisible to the eye: not actually cleaning the surface.

A streak test will show the materials that remain after an alcohol bath. Dampen a piece of a paper towel with alcohol, with a fingertip, run it across the print sheet that you think is clean. If you see any streaks or rainbow effects in the wet area as the alcohol evaporates, the bed has stuff on it.  Take that sheet to the sink, do a thorough soap and hot water wash - rinse until the water is sheeting off - dab the few remaining drops of water with a fresh paper towel. Repeat the streak test. 

 

 

Sort of.  I am a chemist and physician.  IPA is an ok solvent for Human produces waxes and oils.  It will not remove them all.  Soap and water is superior.  

Posted : 28/10/2020 6:44 pm
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(@-2)
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Isopropyl, ethanol, methanol, great liquids. Don't get me wrong. But faced with weeks of struggle to get MY print sheet clean using "prescribed" methods that continually fail, I looked for options. I was given the standard "sand the sheet surface" "use masking tape" "don't print PLA" "use glue" and none of those methods worked. Small contact areas still fell off the sheet. Then, and I can't remember who - sorry dude, said "try soap and water" ... at that point I had nothing to lose and a printer to gain.

15 minutes later it was absolutely clear soap and water worked where everything else had failed. Well, I did not try the sand paper approach.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 28/10/2020 7:25 pm
cwbullet
(@cwbullet)
Famed Member

@tim-m30

I have used sand paper, but it is not a common method for me.  

Posted : 28/10/2020 7:37 pm
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(@-2)
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@charles-h13

lol - yeah - back then the guy was suggesting 80 grit. I doubt that's what you use today.  I can see using 1000 or even finer to clean up the scratches, but not something to grind away and leave a texture.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 28/10/2020 7:42 pm
cwbullet
(@cwbullet)
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@tim-m30

No.  I used 2000-3000 grit.  

Posted : 28/10/2020 8:54 pm
bobstro
(@bobstro)
Illustrious Member
Posted by: @tim-m30

[...] 15 minutes later it was absolutely clear soap and water worked where everything else had failed. Well, I did not try the sand paper approach.

I had pretty much the same experience. In my case, it was Joan's simple note that using Dawn and water washes away contaminants that made things click. Started adhering to the regimen and have not had issues since.

I do use a 3M 7445 pad (1200-1500 grit used for polishing glass & chrome) now and then. I find acetone handy when there are bits of filament that I just can't get off any other way. It also removes oxidation. 

Funny thing is, I'm using my Prusa procedures on my Artillery Sidewinder printer's glass bed and am getting fantastic adhesion with it as well. Reading through the Artillery support forums, the general consensus seems to be that you need to slather the bed with goop to get good adhesion. I am so glad my Prusa was my first 3D printer as all the "good habits" are making life easier on a cheaper printer.

 

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 : 28/10/2020 9:43 pm
sprocket314 and -- liked
Aze
 aze
(@aze)
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I use 99.9% IPA and once in a while it wash the plate with dishsoap when I start having adhesion problems or when I want to use the other side of the sheet, because that is always full of greasy fingers.

Posted : 04/11/2020 3:35 pm
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