Adhesion problems
Ever since i received the printer i've been using it quite a lo, over 650 printing hours since June without any issues, actualy i loved my MK3S but MK4 made everything easier, really happy with it.
Since 5.0 FW been installed i've been printing without IS untill now, to my surprise i'm having huge adhesion problems with it... 🙁 Most likely due to some missconfiguration on my side but can't find it...
First of all a brief summary of my printer
- Printer: Prusa MK4
- Enclouseure: No
- Nozzle: regular 0.4
- Material: PLA
- Sheet: regular (not satin nor textured)
- Belts checked with the app and were perfect, even a bit tighter as i've seen its recommended for IS
I know the inmediate answer is clean the sheet and it's something i always do, true that i do it just with IPA (Isopropilic Alcohol), asit's been enough for since always , but i did a deep clean with warn water and soap either with same results, that being said i did several trys...
First Try:
- Desing of my own: Its a simple box, 200 x 140 x 60, with 1 mm walls and floor
- Print Settings: Own Profile, its a copy of "0.20mm SPEED" changing the output name of the file
- Filament: Own Profile, copy from Prusament PLA just changing temperatures after some tests
- Cleaning: IPA
- Results: Terrible... first layer seemed ok at first but second layer started to seems weird, with texture... few layers later extreme warping and everything went sideways... Huge failure
Second Try:
- Desing of my own: Its a simple box, 200 x 140 x 60, with 1 mm walls and floor
- Print Settings: Default "0.20mm SPEED" profile
- Filament: Default "Pusament PLA" profile
- Cleaning: IPA and Warn water cleaning with soap
- Results: Terrible... better than first try but still terrible...
Third Try (Modified the STL to print and hairspray):
- Desing of my own: A box with some departments (not a straigh box), 200 x 140 x 60, with 2 mm walls and floor
- Print Settings: Default "0.20mm SPEED" profile
- Filament: Default "Pusament PLA" profile
- Cleaning: IPA and Warn water cleaning with soap and HairSpary
- Results: Quite good! I almost got a perfect print, just a little bit of warping on two corners
I tried to print some printing test and they were 10 out of 10, perfect prints, so it just happens with big models... i haven't tried the satin or textured sheet yet but i can predict i'll have severe warping or adhesion problems...
So, i did two thing when it printed ok:
- Modify the design with wider walls and florr (1mm to 2mm) and changing it so it wasn't a straigh box so it had to move more directiions and not just straigh lines. I guess this might help but shouldn't be a problem to print the first desin either
- HairSpray. It's been ages since i stopped using it, since i bought the MK3S (2017) there was no need, do i really have to go back using it???
Also, i saw a fan shroud in printables which seems to improve quality and air flow so i put it on after the trys.
Dont know, seems like first layers are so perfect with IS and i have worst adhesion or i may have something wrong...
RE: Adhesion problems
Images of the prints
First Try
Third Try
My first thought would be a cooling issue combined with damp filament ... are you printing in a draft?
Cheerio,
RE: Adhesion problems
It was a brand new spool so i didn't dry it before, it is a factor to be considered but it's the same filament in the third try when it worked as expected
I'll give it a try though, dry it and print the first design again without hairspray
Thanks
RE: Adhesion problems
I do have some adhesion problems since the update to firmware 5. The solution is to print first layer very slow. I go down as low as 25mm/s and sometimes I need to tune print speed to below 60%. After the first layer setting to 100% does not make any issues.
Also printing first layer more hotter helps.
RE: Adhesion problems
I had to slow it way down for the first layer as well.
RE: Adhesion problems
Now I discovered something: it depends on the filament used.
I am using now different PLA filament and forgot to tune the speed. So it is printing with default 0.2mm speed / Generic PLA settings. There were NO adhesion problems and it is printing fast
Before that I was using Colorfab PLA/PHA filament, which did not stick well at the start. Next I will try Prusament PLA.