[Ender3] first layer looks like a topographic map

[Takumidesh]

recently decided to try a glass bed out.

 

I like the leveling process, but on large first layer prints I get this bumpiness.

 

I am printing the first layer pretty slow, 25mm/s

 

Running Klipper, skr mini e3, dual z.

 

re trammed the bed many times and tried different aggressiveness on the tramming (closer and further)

Seems to get better when the first layer speed is real slow, (5mm/s) but that greatly increases the print times.

smaller prints are fine, though there is occasional bed adhesion problems.

[Levent]

Nozzle is too close to the bed. Your bed is warped or your Z height changes due to other issues.

 

[Kilrah]

Can also be filament temp too low or sticky nozzle, both promoting the filament sticking to the nozzle and getting lifted.

[Takumidesh]

6 minutes ago, Kilrah said:

Can also be filament temp too low or sticky nozzle, both promoting the filament sticking to the nozzle and getting lifted.

I don't really see any difference from 190c to 230c.

13 minutes ago, Levent said:

Nozzle is too close to the bed. Your bed is warped or your Z height changes due to other issues.

 

do you know what is acually happening to cause that behavior? I doubt the glass is warped. and the z-height is very stable with the dual drive z.

The bed height being to close seems like the most likely out of what is listed. which I guess implies that glass beds just always will require some type of adhesion assistance, since going much lower just results in the layer not sticking at all. kinda lame, glass bed so far feels like the least valuable upgrade even though people swear by it so much.

 

to add: by layer two it self corrects quickly, as the layers rise it pushes down on the bumps and eventually works its way out. the bottom of course looks really bad, but it doesn't result in a failed print.

[Levent]

1 minute ago, Takumidesh said:

I doubt the glass is warped.

Funny you say that, the glass that came with my Ender3 v2 was warped. I dumped it out within days and never looked back.

[Takumidesh]

Just now, Levent said:

Funny you say that, the glass that came with my Ender3 v2 was warped. I dumped it out within days and never looked back.

! wow.

I was under the impression that the glass was less likely to be warped. this is an aftermarket bed, amazon 'voyageX' had good reviews. maybe I will bring it in to work on monday and put it on the surface plate.

[W-L]

19 minutes ago, Takumidesh said:

-SNIP-

Normally this is the height as others have said, of course make sure to clean the glass off really well with isopropyl but that propagation across the print happens when a little filament oozes around the nozzle and it progressively gets worst. 

 

It doesn't need much try adjusting the offset by 0.05mm or so that should help.  

[Levent]

Just now, W-L said:

Normally this is the height as others have said, of course make sure to clean the glass off really well with isopropyl but that propagation across the print happens when a little filament oozes around the nozzle and it progressively gets worst. 

 

It doesn't need much try adjusting the offset by 0.05mm or so that should help.  

Actually IPA removes the surface coating Creality uses on their beds, so I would NOT recommend them to use IPA to clean the bed.

[W-L]

Just now, Levent said:

Actually IPA removes the surface coating Creality uses on their beds, so I would NOT recommend them to use IPA to clean the bed.

Their glass is just textured they added a coating now on their new units?

[Takumidesh]

1 minute ago, W-L said:

Normally this is the height as others have said, of course make sure to clean the glass off really well with isopropyl but that propagation across the print happens when a little filament oozes around the nozzle and it progressively gets worst. 

 

It doesn't need much try adjusting the offset by 0.05mm or so that should help.  

 

Just now, Levent said:

Actually IPA removes the surface coating Creality uses on their beds, so I would NOT recommend them to use IPA to clean the bed.

I will try that, it isn't a creality official bed, so I am not sure there are any coatings on it.

 

at least visually it looks like a pretty bog standard glass panel.

[Levent]

Just now, W-L said:

Their glass is just textured they added a coating now on their new units?

The texture is actually a layer of coating.

[Takumidesh]

looking at the patterns, I think the cleaning may be a bigger aspect than I thought.

 

Some of the spots seems to be right in previous print spots where I put my grubby little fingies on the glass.

[W-L]

6 minutes ago, Levent said:

The texture is actually a layer of coating.

4 minutes ago, Takumidesh said:

looking at the patterns, I think the cleaning may be a bigger aspect than I thought.

 

Some of the spots seems to be right in previous print spots where I put my grubby little fingies on the glass.

That's actually etched but they painted the glass, I've not seen the black paint come off before with alcohol but if it's happened then definitely go with something like glass cleaner, or a <50% isopropyl so it's less agressive. 

 

 

[Denial55]

Rub a glue stick on the glass? I have to do that with mine.

[Takumidesh]

after my last print finished, I cleaned the hell out of the glass and that seems to be it! of course it was so simple...

[HP DeskJet2320]

On 1/29/2023 at 7:44 PM, Takumidesh said:

! wow.

I was under the impression that the glass was less likely to be warped. this is an aftermarket bed, amazon 'voyageX' had good reviews. maybe I will bring it in to work on monday and put it on the surface plate.

Can confirm: my Ender 3 V2 glass is slightly warped right in the middle, so whenever I was leveling the bed in the corners everything looked fine until I started printing and the first layer was barely sticking . I put 2 small sheets of aluminum foil in the middle between the glass and the heatbed + applied glue to the glass and now it prints just fine, idk if the aluminum sheets are helping or not but at least the first layer sticks lol.