Ok im having some issues with ABS, just finished an 8 hours print and for some reason the layer adhesion at mid print is kinda bad, dont know if im having understrusion or simply the material is shrinking, any idea? Printed at 260c @ 85c bed
I can’t really tell what is the problem but I had the same with one filament roll when printing at 0.3. Increasing the print quality solved the issue
Maybe your nozzle its almost broken, just change it for a new one and problem solved. I got the same problem in my printers when the nozzle has lots of printing hours.
It looks suspiciously like cracking. Is your printer enclosed at all? ABS is super touchy about temperature changes and even small drafts increasing the cooling rate of a freshly printed section can lead to warping and mid-print delamination like that.
The real solution is a heated build chamber, but even enclosing the printer to prevent breezes and slightly slow cooling can help quite a bit.
Enclosed with front door, the top is open for the filament to move, will try the resolution at 0.2 and the fan was on now that i remember, might be the problem there
@Benjamin_Santalucia printing at 0.3 at the same extrusionwidth gives you less surface where the layers touch. When using for example slic3rs standardextrusionwidth even makes it worse. It reduces the width when cranking up the layerheight. When printing @ 0.3 id go with at least 0.6mm width. It even finishes faster that way.
When printing tall things in abs its always the same sh*t. You have to think like this: every layer is layed down correctly but shrinks. The higher you go the more the first layer is shrunk. After 200 layers the whole thing is warped. You can either go higher temp for more layeradheasion or you can go rather slow so the before layer is cool and harder so it wont bend that much when the next ones are layed down. Or you need a reaally good enclosure and need to heat that up (my printer is that tight enough that the heatbed gets the “chamber” to 40 degrees).
Printing lower layerheights or higher width also helps but the first layers get pulled up that drastically that it doesnt look nice anymore. With large prints on ABS Id rather stick to >0.2mm layerheights.
Also 260 deg is far too much. Ive noticed that over 250 deg it wont stick to each other that good anymore because the polymer degrades. Got this at work. The ceramicheatbed needs 275 on the first layer to stick but you can pull the first layer off because its kinda burned…
Oh and its midprint because on the lower layers the heatbed keeps it warm. And on top the wasnt enough force to break the bonds. But inbetween it was enough warpage to break the bonds cause the heat of the heatbed cant reach that far (yes the heat rises but it also cools down when rising, and the moving bed or nozzle disturbes the rising air)
Enclosing the sides doesn’t help so much if the top is still open. I only do ABS with an actively heated enclosure, but passive can do if it’s reasonably closed up.
To me almost looks like underextrusion. Whole model looks like that, it only gets worse. I’d check extruder calibration
And 85 is a bit low bedtemp for ABS, I’d go for 100 and up
@Matej_Rozman i use to print at 120c using PVA glue and ABS slurry, but the adhesion was a pain on the ass, now im using buildtak at 85c and i cant complain at all, but im working on give a little more material to the print, that might help mitigate the problem
Also, look at building an enclosure I have found it helps…
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