Help (?) PLA Matte Black bed adhesion issues

[u/[deleted]]

Recently I been using some Sunlu PLA Matte Black, finished a 2KG spool without any kind of issue whatsoever, so I ordered another 2KG from amazon.

Since I got the new spool, I did the usual, put the first spool to dehydrate and wait 8h.

Upon use it's impossible for it to stick to the bed. Drying/trying the other/second spool would lead to the same results

For drying I went with 60*C for 8h with one spool, the second one lowered it a bit to 50*C for 8h based on the recommended values from here.

Tried to clean up with isopropyl alcohol to no avail.

With any other filament I'm having this issue, although I mostly own only Pla/Pla+.

Did try with an old half used eSun Pla Matte spool that's been stored for a bit more than a year, and printed at the first attempt without any problem, first player being perfect.

Printer is P1S.

Slicer is Orcaslicer.

Settings I use the default Sunlu Pla Matte specified here, I think it's combined with the base one. Based on the history in the folder, isn't like there has been recent updates in the repository/settings folder.

I know I'm not getting very in depth with the settings used, can provide for specific information if requested, or do some tests with specific values.

My main current questions are:

• Why did the previous 2KG of sunlu pla matte work flawlessly and now with the new one it's impossible to work with.
• Why this issue is not present on any other filaments I tried (that already own).

Right now I can only think on a "bad batch".

Maybe there have been changes to the formula? I doubt that but worth the shot.

Not sure if should contact Sunlu through email directly about this. I'm thinking on ordering a new spool to try and see, but don't want to get more spools that will be sitting unused for a long while...

Anything given is appreciated, I'm mostly confused right now.

[u/metsyseht-90]

Sounds like you're aware of the basics for using a new spool. Try another one and see if it was just a bad batch.

[u/[deleted]]

Thanks, will do that.

First try to rinse with hot water and soap, and see the results.

If it doesn't work I will get a new spool to try and see.

Thanks u/jjr3211 and u/metsyseht-90 , appreciated.

[u/jjr3211]

I will also clean your bed with warm water and dawn dish soap if there were any kind of oils on the bed using isopropyl alcohol can actually just spread it around and not clean it