7d ago

delamination on larger surfaces

I've been noticing some delamination (layer separation), but only on solid infill and top layers, and only on larger surfaces

Initially, I tried reducing speed, but didn't notice any improvement

There are no noticeable issues on short lines, so I think this is something to do with acceleration, which I didn't realise was a thing, but there are indeed settings for this in OrcaSlicer

Update:

Reducing acceleration does seem to have resulted in less severe delamination, but it hasn't gone away completely

So I think I need to reduce it just a little bit more

9 comments

I've been seeing your posts on Masto, but I guess I'll reply here.
I don't know what printer you have, and I don't know if the feature works for all printers, but could you try and use PrusaSlicer to visualise the print where the issue presents itself. More specifically, you could get some interesting data from the "actual print speed" view. That way you can see what speed the printhead reaches.
However, based on your description:
when the printer reaches high print speeds you get delam
slowing down the print head reduces (but doesn't eliminate delam)
Could you be reaching the limit of what your printhead can melt? Would it make sense to calculate the actual flow through your nozzle at those high speeds? Finally, how much part cooling do you have setup? Have you tried a skirt to keep the temps more consistent?
- okay, just viewing the job layer by layer, i can see that the first solid infill layer after the sparse infill is treated as an overhang/bridge and triggers 100% cooling fan (otherwise it's at 0% for the rest of the print)
  and on some items, i can see where the delamination on this layer caused problems on the next couple of layers on top
  but, on other items, there's still delamination happening on the very top layer even without any issues beneath it
  
  The very top layer would also have high cooling fan, no?
  It could be your cooling fan is just waaaay too powerful, and causing the plastic to not flow and bond correctly to the lower (or following) layers.
- Sovol3D SV06 ACE
  OrcaSlicer recently gained a built-in profile for exactly this model, and I've had all sorts of issues since switching to that profile (previously I started with a generic printer profile)
  the new profile is fine on PLA, but PETG is what I'm currently using
  yeah, I only just learnt about the print visualisation feature, the delamination does seem to frequent the same place on the object/plate
  it's the 6x6 panel from https://www.printables.com/model/859807-print6-panels
  the spans from cross hole to cross hole are short and never delaminate
  the long straight edge-to-edge spans that dodge the holes have been troublesome
  the plan is to reduce acceleration a bit more, and then (if that doesn't help) reduce speed a bit (I've already reduced speed and filament volume anyway because of PETG)
Something to consider perhaps, Just a SWAG
Printing temp? Too low of printing temps can cause poor layer bonding.
Air currents. This is noticeable on open bed printers the most. But even enclosed printers can have issues with cooling fans being on too long and at too high of a speed.
- for this 230C - 250C PETG filament, i'm already at 250C (but i've been contemplating bumping it up to 255C)
Is the bed enclosed? I had an older open bed printer and enclosing it solved delam issues for large surface area prints
- No, it's an open bed slinger I think my next printer will be something enclosed

9 comments